[python] Add Spector test cases for @responseAsBool and @clientDoc (Azure/typespec-azure#4268)

[Copilot]

Adds Python mock API tests for the @responseAsBool and @clientDoc TCGC decorator specs introduced in Azure/typespec-azure#4268.

Changes

• Dependency bump: @azure-tools/azure-http-specs → 0.1.0-alpha.40-dev.5 to pull in the new Spector specs
• Bug fix — code generation for @responseAsBool: HEAD operations have no response body, but the generator was emitting _deserialize(Literal[True], response.json()), which throws JSONDecodeError at runtime. Fixed in builder_serializer.py by short-circuiting to deserialized = True / deserialized = False when the response type is a literal constant (ConstantType._is_literal), skipping JSON deserialization entirely.
• New tests (sync + async):
  • test_azure_client_generator_core_response_as_bool[_async] — asserts exists() → True (HTTP 204) and not_exists() → False (HTTP 404)
  • test_azure_client_generator_core_client_doc[_async] — asserts harvest(Plant(...)) round-trips correctly via POST

Code generation before/after

Before (broken — no body on HEAD response):

if response.status_code == 204:
    deserialized = _deserialize(Literal[True], response.json())  # JSONDecodeError

After:

if response.status_code == 204:
    deserialized = True

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