Tests

Implement bytes.startswith in mypyc #19691

Job	Run time
Test mypyc suite with 32-bit Python	9m 15s
Test suite with py313-ubuntu, mypyc-compiled	13m 58s
Test suite with py310-ubuntu, mypyc-compiled	13m 38s
Test suite with py314-ubuntu, mypyc-compiled	13m 55s
Test suite with py311-ubuntu	8m 59s
Type check our own code (py310-windows-64)	2m 48s
mypyc runtime tests with py313-macos	6m 10s
mypyc runtime tests with py310-ubuntu	5m 18s
Test suite with py314t-ubuntu, mypyc-compiled	15m 53s
Test suite with py314-windows-64	26m 20s
Parallel tests with py314-ubuntu, interpreted	20m 41s
Formatting and code style with Black + ruff	1m 56s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 27s
Test suite with py312-ubuntu	10m 0s
Type check our own code (py310-ubuntu)	1m 43s
	3h 0m 1s

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