Eagerly compute SHA's for watched files #11597

Job	Run time
lint_node	42s
lint_ruby	25s
Ruby 3.1 on ubuntu-latest	17m 48s
Ruby 3.2 on ubuntu-latest	14m 23s
Ruby 3.3 on ubuntu-latest	11m 5s
Ruby 3.1 on macos-latest	14m 1s
build_node (ubuntu-latest)	1m 28s
spelling	16s
build_node (macos-latest)	2m 4s
Ruby 3.2 on macos-latest	10m 51s
Verify Jekyll website builds	9s
Ruby 3.3 on macos-latest	8m 20s
build_node (windows-latest)	4m 50s
Ruby 3.1 on windows-latest	27m 5s
Ruby 3.2 on windows-latest	23m 58s
Ruby 3.3 on windows-latest	25m 17s
	2h 42m 42s

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