Test

Add Python 3.15 test infrastructure #35979

Job	Run time
mypy: Run test cases	21m 7s
Check typeshed structure	11s
stub_uploader tests	5m 21s
pyright: Run test cases (Linux, 3.11)	1m 33s
pyright: Run test cases (Linux, 3.13)	1m 32s
pyright: Run test cases (Windows, 3.12)	2m 0s
pyright: Run test cases (Darwin, 3.12)	1m 30s
pyright: Run test cases (Linux, 3.12)	1m 19s
pyright: Run test cases (Windows, 3.14)	1m 36s
pyright: Run test cases (Windows, 3.13)	1m 47s
pyright: Run test cases (Linux, 3.14)	1m 22s
pyright: Run test cases (Windows, 3.11)	1m 27s
pyright: Run test cases (Darwin, 3.11)	1m 40s
pyright: Run test cases (Darwin, 3.13)	1m 45s
pyright: Run test cases (Darwin, 3.14)	1m 29s
mypy: Check stubs (linux, 3.14)	2m 31s
mypy: Check stubs (linux, 3.12)	2m 18s
mypy: Check stubs (win32, 3.10)	2m 12s
mypy: Check stubs (win32, 3.13)	2m 20s
mypy: Check stubs (darwin, 3.15)	23m 49s
mypy: Check stubs (linux, 3.15)	22m 57s
mypy: Check stubs (linux, 3.10)	1m 53s
mypy: Check stubs (win32, 3.14)	2m 14s
mypy: Check stubs (darwin, 3.13)	6m 4s
mypy: Check stubs (win32, 3.15)	23m 44s
mypy: Check stubs (linux, 3.13)	2m 1s
mypy: Check stubs (darwin, 3.10)	5m 49s
mypy: Check stubs (darwin, 3.14)	2m 7s
mypy: Check stubs (darwin, 3.12)	2m 3s
mypy: Check stubs (linux, 3.11)	2m 3s
mypy: Check stubs (win32, 3.11)	2m 56s
mypy: Check stubs (darwin, 3.11)	2m 55s
mypy: Check stubs (win32, 3.12)	3m 8s
	2h 38m 43s

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