Python: [Breaking] removed pydantic from types and workflows (#917)

* removed pydantic from types

* fix test

* fix test

* fix tests

* fix assistants client

* Remove Pydantic usage from workflow code.

* updated pydantic removal

* updated lock and test fixes

* fix mypy

* updated build system

* updated chat client parsing

* fix broken test

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Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>

python/.vscode/tasks.json

@@ -183,7 +183,7 @@
             "args": [
                 "run",
                 "poe",
-                "uv-setup",
+                "setup",
                 "--python=${input:py_version}"
             ],
             "presentation": {