clean: Don't parallelize symlink deletions #10530

Job	Run time
Define the version info for this release	2s
Get the latest prelude hash	5s
build (ubuntu-22.04, aarch64-unknown-linux-gnu, true)	11m 18s
build (ubuntu-22.04, x86_64-unknown-linux-musl, true)	10m 1s
build (macos-13, aarch64-apple-darwin, true)	35m 59s
build (ubuntu-22.04, aarch64-unknown-linux-musl, true)	10m 39s
build (windows-2022, x86_64-pc-windows-msvc, true)	18m 1s
build (ubuntu-22.04, riscv64gc-unknown-linux-gnu, true)	9m 55s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	9m 56s
build (windows-11-arm, aarch64-pc-windows-msvc, true)	17m 56s
build (macos-13, x86_64-apple-darwin)	25m 27s
Check if there's a release for this half of the month already	4s
Release `latest` tag	50s
Publish buck2.build	3m 23s
Release bi-monthly tag	0s
	2h 33m 36s

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