fix(python): Remove oauth-token-override config flag

[tjb9dc]

Description

Refs #11077

Removes the oauth-token-override config flag from the Python SDK generator. OAuth token override is now always enabled for OAuth client credentials flows, allowing users to authenticate with either client_id/client_secret OR a pre-generated bearer token directly via the token parameter without any configuration.

Link to Devin run: https://app.devin.ai/sessions/d9dea7643e314c6691e957657a1252ca
Requested by: [email protected] (@tjb9dc)

Changes Made

• Removed oauth_token_override field from SDKCustomConfig in custom_config.py
• Updated root_client_generator.py to always enable token override when OAuth client credentials is detected
• Updated readme_snippet_builder.py to detect OAuth client credentials from IR instead of config flag (added _check_oauth_client_credentials helper method)
• Removed oauth_token_override parameter from generator_cli.py and sdk_generator.py
• Removed token-override seed fixture directories (behavior now merged into default fixtures)
• Regenerated seed output for oauth-client-credentials and oauth-client-credentials-environment-variables fixtures
• Added version 4.43.1 to versions.yml with PATCH changelog entry

Testing

• Seed tests regenerated and passing for affected fixtures
• Lint checks passing (pnpm run check)

Human Review Checklist

• Verify _check_oauth_client_credentials method in readme_snippet_builder.py correctly identifies OAuth client credentials from IR
• Verify generated SDK constructors still properly validate that either token OR client_id/client_secret are provided
• Confirm seed output changes show correct token override behavior in generated client.py files

[devin-ai-integration]

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