Improve symlink directory detection in environment finder #1270

Job	Run time
Tests (macos-14, aarch64-apple-darwin, yes)	10m 41s
Tests (macos-latest, x86_64-apple-darwin, yes)	11m 59s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 9s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 16s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	9m 4s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 50s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 46s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 48s
Builds (macos-14, aarch64-apple-darwin, yes)	3m 7s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 16s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 44s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	6m 25s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	8m 47s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 44s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 33s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 3s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 7s
	1h 36m 19s

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