build

windows: avoid UNC paths in `run_ui_editor` #12259

Job	Run time
Build jj-lib without Git support	46s
build (ubuntu-latest)	4m 0s
cargo-deny (advisories)	22s
cargo-deny (bans licenses sources)	21s
build (macos-14)	3m 6s
Check protos	23s
Clippy check	2m 25s
Check that MkDocs can build the docs	21s
build (windows-latest)	9m 8s
build (ubuntu-latest, --all-features)	5m 3s
Check that MkDocs can build the docs with Poetry 1.8	31s
Check formatting	14s
	26m 40s

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