chore: fix wrong extension in lsp mappings (#25037)

The mappings were pointing to non-existant `.ts` files. The actual
extension of these is `.js`.

tools/core_import_map.json

@@ -198,12 +198,12 @@
     "node:timers": "../ext/node/polyfills/timers.ts",
     "node:timers/promises": "../ext/node/polyfills/timers/promises.ts",
     "node:tls": "../ext/node/polyfills/tls.ts",
-    "node:tty": "../ext/node/polyfills/tty.ts",
+    "node:tty": "../ext/node/polyfills/tty.js",
     "node:url": "../ext/node/polyfills/url.ts",
     "node:util": "../ext/node/polyfills/util.ts",
     "node:util/types": "../ext/node/polyfills/util/types.ts",
     "node:v8": "../ext/node/polyfills/v8.ts",
-    "node:vm": "../ext/node/polyfills/vm.ts",
+    "node:vm": "../ext/node/polyfills/vm.js",
     "ext:deno_node/wasi.ts": "../ext/node/polyfills/wasi.ts",
     "node:worker_threads": "../ext/node/polyfills/worker_threads.ts",
     "node:zlib": "../ext/node/polyfills/zlib.ts",