Tests

Add support for t-strings (PEP 750). #20936

Job	Run time
Test mypyc suite with 32-bit Python	9m 48s
Test suite with py313-ubuntu, mypyc-compiled	1m 1s
mypyc runtime tests with py313-macos	7m 8s
Test suite with py312-ubuntu	8m 38s
Test suite with py314-windows-64	26m 57s
Test suite with py311-ubuntu	8m 58s
Type check our own code (py310-ubuntu)	1m 32s
Parallel tests with py314-ubuntu, interpreted	26m 16s
Test suite with py314t-ubuntu, mypyc-compiled	17m 8s
Formatting and code style with Black + ruff	1m 58s
Parallel tests with py314-windows-64, interpreted	10m 12s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 24s
Test suite with py314-ubuntu, mypyc-compiled	15m 13s
mypyc runtime tests with py310-ubuntu	5m 51s
Type check our own code (py310-windows-64)	2m 23s
Test suite with py310-ubuntu, mypyc-compiled	1m 17s
	2h 54m 44s

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