Add tests for scm changes for file watchers #7382

Job	Run time
Get the latest prelude hash	4s
build (ubuntu-22.04, aarch64-unknown-linux-gnu, true)	9m 24s
build (ubuntu-22.04, aarch64-unknown-linux-musl, true)	9m 32s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	8m 29s
build (ubuntu-22.04, x86_64-unknown-linux-musl, true)	9m 4s
build (macos-13, aarch64-apple-darwin, true)	19m 23s
build (macos-13, x86_64-apple-darwin)	16m 25s
build (windows-2022, x86_64-pc-windows-msvc, true)	18m 5s
Publish buck2.build	2m 33s
Check if there's a release for this half of the month already	2s
Release `latest` tag	24s
Release bi-monthly tag	0s
	1h 33m 25s

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