[Backport release-24.11] `lib.dropEnd` #38176

Job	Run time
get-merge-commit / resolve-merge-commit	3s
Eval nixpkgs with aliases enabled	37s
Attributes	1m 14s
Outpaths (aarch64-linux)	3m 53s
Outpaths (aarch64-darwin)	3m 31s
Outpaths (x86_64-linux)	4m 7s
Outpaths (x86_64-darwin)	3m 37s
Process	1m 17s
Tag	38s
	18m 57s

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