Tests

Implement bytes.startswith in mypyc #19701

Job	Run time
Test mypyc suite with 32-bit Python	8m 44s
Test suite with py312-ubuntu	9m 47s
Test suite with py311-ubuntu	9m 8s
Test suite with py313-ubuntu, mypyc-compiled	13m 40s
Test suite with py314t-ubuntu, mypyc-compiled	16m 15s
Test suite with py314-windows-64	26m 17s
Type check our own code (py310-windows-64)	2m 45s
mypyc runtime tests with py313-macos	5m 30s
Test suite with py310-ubuntu, mypyc-compiled	13m 39s
mypyc runtime tests with py310-ubuntu	5m 21s
Type check our own code (py310-ubuntu)	1m 43s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 55s
Parallel tests with py314-ubuntu, interpreted	23m 5s
Test suite with py314-ubuntu, mypyc-compiled	13m 36s
Formatting and code style with Black + ruff	1m 59s
	2h 58m 24s

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