[python] add test case for https://github.com/microsoft/typespec/pull/10529

[msyyc]

follow skill https://github.com/microsoft/typespec/blob/main/.github/skills/python-sdk-spector-mock-api-tests/SKILL.md to write test case for #10529

[github-actions]

🎯 Issue Triage

This is a task to add Spector mock API test cases for the Python client emitter, following the changes introduced in PR #10529.

Category: Feature
Area: emitter:client:python

🔍 Analysis

• This is a work task, not a bug report — it requests adding test coverage for PR feat(http-specs): add test for operation body params with reserved names #10529 using the writing-python-sdk-spector-mock-api-tests skill.
• The issue references the skill guide at .github/skills/python-sdk-spector-mock-api-tests/SKILL.md and links directly to the PR to be covered.
• Assigned to msyyc and Copilot.
• No reproduction code needed as this is a feature/test-addition task.

📝 Suggested next steps

• Review the changes in PR feat(http-specs): add test for operation body params with reserved names #10529 to identify which Spector scenarios need test coverage
• Follow the skill guide to write the corresponding mock API tests
• Submit a PR with the new test cases

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