libutil: Add PathFmt wrapped type for formatting fs::path, fix all double-quoting issues#15030

Ericson2314 merged 2 commits intoNixOS:masterNixOS/nix:masterfrom

xokdvium:path-fmt-squash-double-quotesxokdvium/nix:path-fmt-squash-double-quotesCopy head branch name to clipboard