Refactor symlink handling in CacheEntryImpl to improve thread safety … #1195

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 33s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 16s
Tests (macos-latest, x86_64-apple-darwin, yes)	10m 13s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 22s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 20s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	6m 48s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 6s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 3s
Tests (macos-14, aarch64-apple-darwin, yes)	12m 35s
Builds (macos-14, aarch64-apple-darwin, yes)	1m 56s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 40s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 29s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 56s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 34s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	7m 26s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 53s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 30s
	1h 25m 40s

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