[python] add test case for https://github.com/microsoft/typespec/pull/11677

[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 #11677

[github-actions]

🎯 Issue Triage

This is a task to add Python SDK Spector mock API test cases following the skill guide, covering the changes introduced in #11677.

Category: Feature
Area: emitter:client:python

🔍 Analysis

• The issue references a specific merged/open PR ([Spector] Add 200 body / 204 no-content success response scenario #11677) for which new Spector mock API tests need to be written.
• Work should follow the established skill instructions for writing Python SDK Spector mock API tests.
• No reproduction code is needed — this is a test coverage task.

📝 Suggested next steps

• Review the changes in #11677 to understand what new scenarios need test coverage.
• Follow the SKILL.md guide to write the test cases.
• Open a PR with the new tests referencing this issue.

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