[python] Add mock API coverage for azure client-generator-core alternate-type scenario

[Copilot]

This adds missing Python mock API coverage requested for the Spector changes from Azure/typespec-azure PR #4408, focused on the azure/client-generator-core/alternate-type scenario.
Coverage is now present in both sync and async test suites for the generated Azure flavor client.

• Added sync mock API tests (azure flavor)

  • New file: packages/http-client-python/tests/mock_api/azure/test_azure_client_generator_core_alternate_type.py
  • Covers:
    • external_type.get_model()
    • external_type.put_model(...)
    • external_type.get_property()
    • external_type.put_property(...)

• Added async mock API tests (azure flavor)

  • New file: packages/http-client-python/tests/mock_api/azure/asynctests/test_azure_client_generator_core_alternate_type_async.py
  • Mirrors sync coverage for the corresponding async client surface.

• Changelog

  • Added internal Chronus entry for @typespec/http-client-python.

FEATURE = geojson.Feature(
    geometry=geojson.Point((-122.25, 37.87)),
    properties={"name": "A single point of interest", "category": "landmark", "elevation": 100},
    id="feature-1",
)

result = client.external_type.get_model()
assert result == FEATURE

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[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-python@10659

commit: b0c8778

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - internal ✏️

Add sync and async mock API tests for the azure/client-generator-core/alternate-type Spector scenario