Test

Add Python 3.15 test infrastructure #35972

Job	Run time
mypy: Run test cases	8s
stub_uploader tests	2m 22s
Check typeshed structure	14s
pyright: Run test cases (Linux, 3.14)	1m 43s
pyright: Run test cases (Linux, 3.12)	1m 36s
pyright: Run test cases (Windows, 3.13)	1m 24s
pyright: Run test cases (Linux, 3.13)	1m 25s
pyright: Run test cases (Windows, 3.12)	1m 41s
pyright: Run test cases (Windows, 3.15)	40s
pyright: Run test cases (Darwin, 3.15)	1m 6s
pyright: Run test cases (Windows, 3.11)	1m 26s
pyright: Run test cases (Darwin, 3.13)	1m 31s
pyright: Run test cases (Linux, 3.11)	1m 22s
pyright: Run test cases (Darwin, 3.12)	1m 19s
mypy: Check stubs (linux, 3.11)	2m 22s
pyright: Run test cases (Windows, 3.14)	1m 19s
mypy: Check stubs (linux, 3.13)	2m 12s
pyright: Run test cases (Linux, 3.15)	2m 22s
mypy: Check stubs (darwin, 3.14)	2m 21s
pyright: Run test cases (Darwin, 3.11)	1m 34s
mypy: Check stubs (darwin, 3.12)	2m 5s
pyright: Run test cases (Darwin, 3.14)	1m 22s
mypy: Check stubs (win32, 3.11)	2m 17s
mypy: Check stubs (darwin, 3.11)	1m 59s
mypy: Check stubs (linux, 3.10)	1m 55s
mypy: Check stubs (win32, 3.15)	2m 33s
mypy: Check stubs (linux, 3.14)	2m 23s
mypy: Check stubs (linux, 3.12)	2m 8s
mypy: Check stubs (darwin, 3.15)	2m 19s
mypy: Check stubs (darwin, 3.13)	2m 16s
mypy: Check stubs (win32, 3.14)	2m 18s
mypy: Check stubs (win32, 3.13)	2m 21s
mypy: Check stubs (darwin, 3.10)	2m 17s
mypy: Check stubs (win32, 3.10)	2m 1s
mypy: Check stubs (linux, 3.15)	2m 23s
mypy: Check stubs (win32, 3.12)	2m 8s
	1h 4m 52s

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