feat(python): further improvements to OAuth token override support

[kafkas]

Description

Builds on #11077 with a few follow-up improvements:

• Refines the generated client docstrings so constructor parameters are documented separately for each overload, matching the callable overload signatures.
• Updates the public API so the token parameter is typed as Callable[[], str].
• Cleans up stale seed output from the old fixtures that are now split into no-custom-config and token-override sub-fixtures`.
• Updates the Seed output for the oauth-client-credentials:token-override fixture to reflect the docstring changes.

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Note

Improves generated OAuth client constructors by typing token as Callable[[], str], generating overload-specific parameter docs/overloads for token vs client credentials, and updates seed output while removing stale fixtures.

• Python Generator (Root Client):
  • Refines docstrings for OAuth client-credentials with token override: writes separate parameter blocks per constructor overload and suppresses default param docs when override is enabled.
  • Types token as Callable[[], str] across signatures/overloads and uses the provided callable directly in client wrapper.
  • Adjusts overloads: client_id/client_secret required at the overload level (with env defaults), and token overload requires a callable.
  • Centralizes/uses constant docs for httpx_client and follow_redirects parameters.
• Seed Output:
  • Updates oauth-client-credentials:token-override fixture to reflect new typings and docstrings.
  • Removes stale seed fixtures (oauth-client-credentials, oauth-client-credentials-environment-variables, pagination) and related files.

^{Written by Cursor Bugbot for commit 3fcb30d. This will update automatically on new commits. Configure here.}

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