Support context mananger in commit scheduler (#2670) #6878

Job	Run time
build-ubuntu (3.8, Repository only)	1m 56s
build-ubuntu (3.8, Everything else)	3m 4s
build-windows (3.8)	6m 1s
build-ubuntu (3.13, Repository only)	1m 55s
build-ubuntu (3.13, Everything else)	4m 27s
build-ubuntu (3.13, lfs)	56s
build-ubuntu (3.8, fastai)	1m 20s
build-ubuntu (3.10, fastai)	56s
build-ubuntu (3.8, tensorflow)	57s
build-ubuntu (3.10, tensorflow)	1m 5s
build-ubuntu (3.8, Python 3.8, torch_1.11)	1m 5s
build-ubuntu (3.12, torch_latest)	58s
	24m 40s

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