tests

test: add MySQL MCP tests #4668

Job	Run time
unit tests (3.13)	1m 2s
integration tests (macos-latest, 3.9)	1m 38s
integration tests (windows-latest, 3.9)	1m 50s
integration tests (macos-latest, 3.13)	1m 24s
unit tests (3.9)	1m 3s
integration tests (windows-latest, 3.13)	1m 36s
integration tests (ubuntu-latest, 3.13)	54s
integration tests (ubuntu-latest, 3.9)	1m 22s
	10m 49s

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