Fix Mypy issues ASAP

[sanderegg]

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Planned changes

Fixing the mypy issues all over the repo is of the highest importance, as a few important bugs are found (such as misuse of libraries and some other wrongly typed calls).
Therefore an action must be taken on the backend side ASAP.

All the libraries where continue-on-error: true is found in .github/workflows/ci-testing-deploy.yml must be tackled.

Tasks

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1. webserver (MD/ANE/SAN)
2. ♻️ Maintenance: Fixes mypy in api-server #6175
   a:api t:maintenance +2
   
3. catalog (SAN)
4. director-v2 (SAN)
5. aws-library (SAN)
6. dask-task-models-library (SAN)
7. osparc-gateway-server (SAN)
8. payments (MD)
9. dynamic-scheduler (ANE)
10. dynamic-sidecar (ANE)
11. efs-guardian (MD)
12. postgres-database (SAN)
13. invitations (SAN)
14. service-integration (ANE)
15. service-library (SAN)
16. notifications-library (SAN)
17. simcore-sdk (SAN)

procedure

# go to package
make install-dev
make mypy
# enjoy

2. add in setup.cfg:

[mypy]
plugins =
	pydantic.mypy

or

[mypy]
plugins =
	pydantic.mypy
	sqlalchemy.ext.mypy.plugin

if using also sqlalchemy in the service/package
3. add needed types-aiofiles or others in the _test.in requirements (as suggested by mypy)

cd requirements
make touch reqs upgrade=types

4. remove continue-on-error: true in https://github.com/ITISFoundation/osparc-simcore/blob/fb5b8b5ce9ccc5131adbb75cab4e0311d7aefde7/.github/workflows/ci-testing-deploy.yml