tests

test: add MySQL MCP tests #4669

Job	Run time
unit tests (3.9)	1m 5s
integration tests (windows-latest, 3.9)	1m 19s
integration tests (windows-latest, 3.13)	1m 33s
integration tests (ubuntu-latest, 3.9)	53s
integration tests (macos-latest, 3.9)	1m 52s
integration tests (ubuntu-latest, 3.13)	52s
unit tests (3.13)	1m 2s
integration tests (macos-latest, 3.13)	1m 27s
	10m 3s

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