Test

Add Python 3.15 test infrastructure #35993

Job	Run time
mypy: Run test cases	18m 39s
stub_uploader tests	4m 31s
pyright: Run test cases (Linux, 3.13)	1m 17s
pyright: Run test cases (Windows, 3.13)	1m 45s
pyright: Run test cases (Linux, 3.12)	1m 33s
pyright: Run test cases (Linux, 3.11)	1m 40s
pyright: Run test cases (Darwin, 3.11)	1m 28s
pyright: Run test cases (Darwin, 3.13)	1m 52s
pyright: Run test cases (Darwin, 3.12)	1m 21s
pyright: Run test cases (Windows, 3.12)	1m 31s
Check typeshed structure	15s
pyright: Run test cases (Windows, 3.14)	1m 36s
pyright: Run test cases (Darwin, 3.14)	1m 43s
pyright: Run test cases (Windows, 3.11)	1m 20s
pyright: Run test cases (Linux, 3.14)	1m 38s
mypy: Check stubs (linux, 3.14)	1m 57s
mypy: Check stubs (linux, 3.15)	4m 51s
mypy: Check stubs (darwin, 3.10)	2m 2s
mypy: Check stubs (win32, 3.12)	2m 1s
mypy: Check stubs (darwin, 3.13)	7m 57s
mypy: Check stubs (linux, 3.13)	1m 53s
mypy: Check stubs (win32, 3.10)	2m 1s
mypy: Check stubs (darwin, 3.14)	1m 58s
mypy: Check stubs (win32, 3.15)	4m 26s
mypy: Check stubs (linux, 3.11)	2m 2s
mypy: Check stubs (linux, 3.10)	1m 56s
mypy: Check stubs (win32, 3.14)	2m 9s
mypy: Check stubs (win32, 3.11)	1m 49s
mypy: Check stubs (win32, 3.13)	2m 18s
mypy: Check stubs (darwin, 3.11)	2m 24s
mypy: Check stubs (darwin, 3.12)	2m 15s
mypy: Check stubs (darwin, 3.15)	5m 0s
mypy: Check stubs (linux, 3.12)	2m 9s
	1h 33m 17s

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