[python] Add test case for GroupParameters.group override applying to all languages

[Copilot]

Azure/typespec-azure#4220 removed the "!javascript" scope exclusion from @@override on GroupParameters.group, making parameter grouping apply to all languages. This adds Python mock API tests that explicitly validate the resulting SDK signature.

Changes

• package.json: Bump @azure-tools/azure-http-specs from 0.1.0-alpha.39 → 0.1.0-alpha.40-dev.2 (first version published after the PR merge)
• test_azure_client_generator_core_override.py / *_async.py: Add test_group_parameters_signature (sync + async) verifying that group_parameters.group exposes param1 and param2 as keyword-only required parameters — the expected result of the GroupParametersOptions grouping override:

def test_group_parameters_signature(client: OverrideClient):
    group_method = client.group_parameters.group
    sig = inspect.signature(group_method)
    params = sig.parameters

    assert params["param1"].kind == params["param1"].KEYWORD_ONLY
    assert params["param2"].kind == params["param2"].KEYWORD_ONLY
    assert params["param1"].default == params["param1"].empty
    assert params["param2"].default == params["param2"].empty

Warning

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