Improve error message for file watcher test failures #12875

Job	Run time
Get the latest prelude hash	6s
Define the version info for this release	2s
build (ubuntu-22.04, aarch64-unknown-linux-gnu, true)	16m 31s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	16m 29s
build (ubuntu-22.04, aarch64-unknown-linux-musl, true)	11m 34s
build (macos-15, x86_64-apple-darwin)	23m 21s
build (ubuntu-22.04, riscv64gc-unknown-linux-gnu, true)	15m 34s
build (windows-11-arm, aarch64-pc-windows-msvc, true)	20m 52s
build (ubuntu-22.04, x86_64-unknown-linux-musl, true)	11m 6s
build (windows-2022, x86_64-pc-windows-msvc, true)	27m 14s
build (macos-15, aarch64-apple-darwin, true)	21m 9s
Check if there's a release for this half of the month already	3s
Publish buck2.build	2m 49s
Release `latest` tag	1m 3s
Release bi-monthly tag	-1s
	2h 47m 52s

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