[python] Add mock_api coverage for single-discriminator no-subtypes and body-root nested scenarios

[Copilot]

This adds python mock API coverage for new Spector scenarios introduced by the cross-language spec updates (PR #10841): a discriminated model with no declared subtypes, and a @bodyRoot parameter nested inside a wrapper model. The PR extends existing single-discriminator tests in both sync and async suites, adds new shared body-root tests, and aligns local spec inputs to a version that contains the scenarios.

• Test coverage: single-discriminator no-subtypes (shared sync/async)

  • Extended existing shared tests to cover:
    • get_no_subtypes_model()
    • put_no_subtypes_model(...)
  • Added Fish model assertions to validate the expected wire payload shape (kind, size).

• Test coverage: body-root nested (shared sync/async)

  • Added new shared tests (test_parameters_body_root.py and asynctests/test_parameters_body_root_async.py) covering the nested(...) operation with a BodyRootModel (category, link_type, was_successful).
  • Validated locally against the Spector mock server.

• Spec dependency update for scenario availability

  • Updated @typespec/http-specs in packages/http-client-python/package.json (and lockfile) to a version containing the new scenario definitions used by regeneration.

• Change tracking

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

def test_get_no_subtypes_model(client):
    assert client.get_no_subtypes_model() == Fish(kind="salmon", size=10)

def test_put_no_subtypes_model(client):
    client.put_no_subtypes_model(Fish(kind="salmon", size=10))

def test_nested(client):
    client.nested(BodyRootModel(category="widget", link_type="hard", was_successful=True))

Note: The third scenario from PR #10841, Parameters_Query_SpecialChar_dollarSign, is intentionally not covered. There is an upstream spec inconsistency where main.tsp declares @route("/dollarSign") (camelCase) while mockapi.ts registers the endpoint at /dollar-sign (kebab-case). The mock server only serves /dollar-sign, while the generated SDK correctly calls /dollarSign, so the test would 404. This requires a fix in @typespec/http-specs before SDK coverage can pass.

[msyyc]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflict in packages/http-client-python/package-lock.json (version conflict — kept 0.31.0 from main to match package.json) and completed the merge of origin/main in 6f0cf3d.

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npm i https://pkg.pr.new/@typespec/http-client-python@10896

commit: 395b2bb

[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 single-discriminator no-subtypes and body-root nested Spector scenarios from http-specs.