Remove:

[mypy-semantic_kernel.connectors.ai.open_ai.*]
ignore_errors = true

from mypy.ini

And improve ai.open_ai.* test coverage to over 95% without pragma: no cover

Remove tests/integration/completions/test_oai_chat_service.py and tests/integration/completions/test_azure_oai_chat_service_extensions.py and move relevant tests over to tests/integration/completions/test_chat_completions.py if not already present (potentially remove tests all together).