[Bug]: @azure-tools/typespec-python tsp compile --watch broken

[johanste]

Describe the bug

Looks like data is being retained across emit calls....

Reproduction

@service
namespace Repro;

model Something {
    data: string;
}

op doSomething(...Something): Something;

$> tsp compile . --watch --emit=@azure-tools/typespec-python

Compiles first time. Add some newlines. Save the file. Kaboom.

raceback (most recent call last):
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/eng/scripts/setup/run_tsp.py", line 41, in <module>
    codegen.CodeGenerator(output_folder=args.output_folder, cadl_file=args.cadl_file, **unknown_args).process()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/__init__.py", line 343, in process
    code_model = CodeModel(yaml_data=yaml_data, options=options)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 89, in __init__
    self.sort_model_types()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 385, in sort_model_types
    sorted_object_schemas.extend(self._sort_model_types_helper(schema, seen_schema_names, seen_schema_yaml_ids))
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 362, in _sort_model_types_helper
    raise ValueError(f"We have already generated a schema with name {current.name}")
ValueError: We have already generated a schema with name Something
Emitter "@azure-tools/typespec-python" crashed! This is a bug.
Please file an issue at https://github.com/Azure/autorest.python/issues

Error: Command failed: /Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/venv/bin/python /Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/eng/scripts/setup/run_tsp.py --package-version=1.0.0b1 --generate-packaging-files=true --flavor=azure --package-dir=azureaifoundry --package-name=azureaifoundry --models-mode=dpg --package-mode=azure-dataplane --enable-typespec-namespace=false --emit-cross-language-definition-file=true --from-typespec=true --output-folder=/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/tsp-output/@azure-tools/typ
Traceback (most recent call last):
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/eng/scripts/setup/run_tsp.py", line 41, in <module>
    codegen.CodeGenerator(output_folder=args.output_folder, cadl_file=args.cadl_file, **unknown_args).process()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/__init__.py", line 343, in process
    code_model = CodeModel(yaml_data=yaml_data, options=options)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 89, in __init__
    self.sort_model_types()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 385, in sort_model_types
    sorted_object_schemas.extend(self._sort_model_types_helper(schema, seen_schema_names, seen_schema_yaml_ids))
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 362, in _sort_model_types_helper
    raise ValueError(f"We have already generated a schema with name {current.name}")
ValueError: We have already generated a schema with name Something
Emitter "@azure-tools/typespec-python" crashed! This is a bug.
Please file an issue at https://github.com/Azure/autorest.python/issues

Error: Command failed: /Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/venv/bin/python /Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/eng/scripts/setup/run_tsp.py --package-version=1.0.0b1 --generate-packaging-files=true --flavor=azure --package-dir=azureaifoundry --package-name=azureaifoundry --models-mode=dpg --package-mode=azure-dataplane --enable-typespec-namespace=false --emit-cross-language-definition-file=true --from-typespec=true --output-folder=/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/tsp-output/@azure-tools/typespec-python --cadl-file=/var/folders/xx/z3qhdzcs091cvczt40lly1c00000gn/T/cadl-codegen/python-yaml-path773df198-c0bd-4da9-a6ab-508f8b28f29f.yaml
Traceback (most recent call last):
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/eng/scripts/setup/run_tsp.py", line 41, in <module>
    codegen.CodeGenerator(output_folder=args.output_folder, cadl_file=args.cadl_file, **unknown_args).process()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/__init__.py", line 343, in process
    code_model = CodeModel(yaml_data=yaml_data, options=options)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 89, in __init__
    self.sort_model_types()
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 385, in sort_model_types
    sorted_object_schemas.extend(self._sort_model_types_helper(schema, seen_schema_names, seen_schema_yaml_ids))
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/generator/pygen/codegen/models/code_model.py", line 362, in _sort_model_types_helper
    raise ValueError(f"We have already generated a schema with name {current.name}")
ValueError: We have already generated a schema with name Something

    at genericNodeError (node:internal/errors:984:15)
    at wrappedFn (node:internal/errors:538:14)
    at checkExecSyncError (node:child_process:891:11)
    at execSync (node:child_process:963:15)
    at $onEmit (file:///Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/http-client-python/dist/emitter/emitter.js:163:13)
    at async Object.$onEmit [as emitFunction] (file:///Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@azure-tools/typespec-python/dist/src/emitter.js:7:5)
    at async runEmitter (file:///Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/compiler/dist/src/core/program.js:368:13)
    at async compile (file:///Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/compiler/dist/src/core/program.js:124:9)
    at async run (file:///Users/johanstenberg/ongoing/uxagent/agent-first-sdk/typespec/node_modules/@typespec/compiler/dist/src/core/cli/actions/compile/compile.js:63:24)

--------------------------------------------------
Library Version                0.38.4
TypeSpec Compiler Version      0.65.3
--------------------------------------------------

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.