[python] Add mock API tests for Azure/typespec-azure PR #4959 Spector scenarios

[Copilot]

Adds Python SDK mock API tests for new Spector scenarios introduced in Azure/typespec-azure#4959. Bumps @azure-tools/azure-http-specs to 0.1.0-alpha.44-dev.5 to include the unreleased specs.

New test coverage

azure/resource-manager/operation-templates — 7 sync + 7 async tests added to existing files:

• LRO.getLro — GET with @markAsLro
• LROPaging.postPagingLroWithBody — POST LRO returning paged results
• Legacy.routedGet — GET via Legacy.RoutedOperations with custom route
• Legacy.createOrReplaceOptionalBody — PUT with optional body (both empty and populated)
• Paging.postActionPaging — POST returning ItemPaged results
• Paging.markAsPageable — GET list via @markAsPageable

azure/client-generator-core/api-version/client-api-versions — new sync + async test files:

• Validates @clientApiVersions allows sending an older API version not in the service versions list

# Client constructed with api_version="2022-10-01" even though service only advertises "2024-01-01"
with ClientApiVersionsClient(endpoint="http://localhost:3000", api_version="2022-10-01") as client:
    client.send_api_version()  # succeeds

Note: azure/resource-manager/service-group and related arm-resource-identifier specs from the same PR are not testable yet — they require Extension.ServiceGroup support in @azure-tools/typespec-azure-resource-manager which is not yet available in the current workspace.

• Fixes [python] add test case for https://github.com/Azure/typespec-azure/pull/4959 #11409

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