Tests

Add support for t-strings (PEP 750). #20935

Job	Run time
Test suite with py311-ubuntu	8m 41s
Test suite with py310-ubuntu, mypyc-compiled	1m 15s
Test suite with py314-windows-64	23m 9s
Test suite with py312-ubuntu	9m 8s
Test suite with py314-ubuntu, mypyc-compiled	1m 3s
Test suite with py313-ubuntu, mypyc-compiled	1m 2s
Test suite with py314t-ubuntu, mypyc-compiled	1m 17s
Type check our own code (py310-ubuntu)	1m 40s
Type check our own code (py310-windows-64)	2m 13s
Test mypyc suite with 32-bit Python	10m 4s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 9s
Parallel tests with py314-ubuntu, interpreted	23m 5s
Parallel tests with py314-windows-64, interpreted	11m 14s
mypyc runtime tests with py310-ubuntu	5m 17s
Formatting and code style with Black + ruff	1m 58s
mypyc runtime tests with py313-macos	4m 26s
	1h 46m 41s

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