fix(http-client-python): clear mypy [no-any-return] in generated _validation.py

[l0lawrence]

Problem

Generated SDK code produces a mypy error in _validation.py:

```n_validation.py:26: error: Returning Any from function declared to return int [no-any-return]

The offending line is `return api_versions_list.index(value)` inside `_index_with_default`. Because `api_versions_list` is pulled from untyped `**kwargs` via `kwargs.pop(...)`, mypy infers it as `Any`, so `.index(value)` returns `Any` from a function declared `-> int`.

## Fix

Type-annotate the local `api_versions_list` as `list[str]` in the `validation.py.jinja2` template (Python 3.10+ is already the minimum supported version). This is sufficient to clear the `[no-any-return]` error in the generated `_validation.py`.

## Verification

Reproduced the original mypy error against the unmodified template body and confirmed it is cleared after the change with `mypy --python-version 3.10 --strict`.

Reported against `azure/search/documents/_validation.py`.

[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-python@10571

commit: be42d11

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - fix ✏️

Fix mypy [no-any-return] error in generated _validation.py by typing api_versions_list as list[str] so _index_with_default returns int rather than Any.

[azure-sdk]

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