Add Python test cases for documentation namespace in azure and unbranded

[Copilot]

Adds test coverage for the documentation namespace spec (bullet points, numbered lists, text formatting) to azure and unbranded mock API test suites, mirroring the existing generic_mock_api_tests.

Changes

• New test files:

  • test_specs_documentation.py in azure/mock_api_tests and unbranded/mock_api_tests
  • test_specs_documentation_async.py in azure/mock_api_tests/asynctests and unbranded/mock_api_tests/asynctests

• Test coverage: All 6 scenarios from TypeSpec documentation spec:

  • Lists: bulletPointsOp, bulletPointsModel (skipped per [http-specs][bug] API doesn't follow runtime behavior #9173), numbered
  • Text formatting: boldText, italicText, combinedFormatting

• Changelog: Added entry under version 0.24.2

Tests follow the same pattern as other azure/unbranded tests (e.g., encode_duration).

Original prompt

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This section details on the original issue you should resolve

<issue_title>[python] add test case</issue_title>
<issue_description>GOAL:

• add test case in /workspaces/typespec/packages/http-client-python/generator/test/generic_mock_api_tests/test_specs_documentation.py and /workspaces/typespec/packages/http-client-python/generator/test/generic_mock_api_tests/asynctests/test_specs_documentation_async.py for [http-specs] Fix bulletPointsModel API signature to match runtime behavior #9200 which fixed a case then we could test it.
• add test case in /workspaces/typespec/packages/http-client-python/generator/test/azure/mock_api_tests and /workspaces/typespec/packages/http-client-python/generator/test/unbranded/mock_api_tests for https://github.com/microsoft/typespec/pull/9259/files which added a new case

NOTE:

• DO add changelog
• DO format your changed files before commit</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [python] add test case #9386

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[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - internal ✏️

Add test case

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commit: b18a78e