Use Arc<[PathBuf]> to reduce cloning overhead for shared path lists #1207

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 30s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 55s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 26s
Tests (macos-latest, x86_64-apple-darwin, yes)	13m 7s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 54s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	10m 45s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 57s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 30s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 32s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 49s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 9s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 40s
Builds (macos-14, aarch64-apple-darwin, yes)	3m 11s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 43s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 35s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 54s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	3m 1s
	1h 33m 38s

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