Use Arc<[PathBuf]> to reduce cloning overhead for shared path lists (… #1211

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 26s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 22s
Tests (macos-latest, x86_64-apple-darwin, yes)	14m 19s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 57s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 31s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 5s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 55s
Builds (windows-latest, x86_64-pc-windows-msvc)	3m 47s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 44s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 5s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 22s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 39s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 26s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 32s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 15s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 3s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 56s
	1h 28m 24s

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