Tests

Improve override error note for LSP violations #21901

Job	Run time
Test mypyc suite with 32-bit Python	9m 59s
Test suite with py310-ubuntu, mypyc-compiled	16m 12s
Parallel tests with py314-windows-64, interpreted	10m 48s
Test suite with py314t-ubuntu, mypyc-compiled	17m 16s
mypyc runtime tests with py313-macos	5m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 27s
Test suite with py314-ubuntu, mypyc-compiled	14m 58s
Test suite with py313-ubuntu, mypyc-compiled	16m 9s
Test suite with py314-windows-64	28m 5s
Type check our own code (py310-windows-64)	1m 58s
mypyc runtime tests with py310-ubuntu	6m 29s
Type check our own code (py310-ubuntu)	1m 9s
Test suite with py311-ubuntu	9m 30s
Test suite with py312-ubuntu	9m 41s
Parallel tests with py314-ubuntu, interpreted	24m 10s
Formatting and code style with Black + ruff	1m 51s
	3h 22m 41s

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