Test

Add Python 3.15 test infrastructure #35977

Job	Run time
mypy: Run test cases	2m 47s
stub_uploader tests	2m 16s
Check typeshed structure	10s
pyright: Run test cases (Linux, 3.11)	1m 39s
pyright: Run test cases (Darwin, 3.14)	1m 35s
pyright: Run test cases (Darwin, 3.12)	1m 55s
pyright: Run test cases (Linux, 3.13)	1m 30s
pyright: Run test cases (Darwin, 3.13)	1m 30s
pyright: Run test cases (Windows, 3.13)	1m 24s
pyright: Run test cases (Linux, 3.12)	1m 26s
pyright: Run test cases (Darwin, 3.11)	1m 33s
pyright: Run test cases (Windows, 3.12)	1m 26s
pyright: Run test cases (Windows, 3.11)	1m 28s
mypy: Check stubs (linux, 3.12)	2m 45s
pyright: Run test cases (Windows, 3.14)	1m 24s
pyright: Run test cases (Linux, 3.14)	1m 21s
mypy: Check stubs (linux, 3.14)	1m 58s
mypy: Check stubs (linux, 3.15)	2m 48s
mypy: Check stubs (win32, 3.12)	2m 7s
mypy: Check stubs (win32, 3.11)	2m 2s
mypy: Check stubs (linux, 3.10)	1m 53s
mypy: Check stubs (darwin, 3.13)	2m 15s
mypy: Check stubs (darwin, 3.12)	2m 4s
mypy: Check stubs (win32, 3.10)	2m 15s
mypy: Check stubs (darwin, 3.11)	2m 45s
mypy: Check stubs (win32, 3.14)	2m 9s
mypy: Check stubs (linux, 3.11)	2m 1s
mypy: Check stubs (darwin, 3.14)	2m 20s
mypy: Check stubs (linux, 3.13)	2m 17s
mypy: Check stubs (win32, 3.13)	2m 14s
mypy: Check stubs (win32, 3.15)	2m 32s
mypy: Check stubs (darwin, 3.15)	2m 48s
mypy: Check stubs (darwin, 3.10)	2m 16s
	1h 4m 53s

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