Hoist torchbench run-contexts out of the timed loop #1585

Job	Run time
Build wheels on ubuntu-latest	41m 46s
Build source distribution	10s
Build wheels on macos-latest	7m 33s
Build wheels on windows-latest	8m 30s
Run Tests (ubuntu-24.04-arm, 3.14.6)	10m 7s
Run Tests (ubuntu-latest, 3.14.4)	14m 37s
Run Tests (ubuntu-latest, 3.14.5)	10m 54s
Run Tests (ubuntu-24.04-arm, 3.14.4)	10m 1s
Run Tests (ubuntu-latest, 3.14.6)	14m 17s
Run Tests (ubuntu-latest, 3.14t)	9m 4s
Run Tests (windows-latest, 3.14.6)	11m 6s
Run Tests (macos-latest, 3.14.4)	8m 24s
Run Tests (macos-latest, 3.14.6)	7m 47s
Run Tests (macos-latest, 3.14.5)	9m 3s
Run Tests (ubuntu-24.04-arm, 3.14.3)	10m 30s
Run Tests (macos-latest, 3.14.3)	9m 24s
Run Tests (windows-latest, 3.14.3)	11m 41s
Run Tests (ubuntu-latest, 3.14.3)	15m 25s
Run Tests (windows-latest, 3.14.4)	12m 38s
Run Tests (windows-latest, 3.14.5)	10m 54s
Build wheels on ubuntu-24.04-arm	35m 39s
Run Tests (ubuntu-24.04-arm, 3.14.5)	10m 16s
Run Tests (ubuntu-latest, 3.15.0-beta.1)	13m 35s
	4h 53m 21s

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