Improve symlink directory detection in environment finder #1272

Job	Run time
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	9m 23s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 50s
Tests (macos-latest, x86_64-apple-darwin, yes)	12m 28s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 55s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 44s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 17s
Builds (macos-latest, x86_64-apple-darwin, yes)	1m 2s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 25s
Tests (macos-14, aarch64-apple-darwin, yes)	10m 7s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 19s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 47s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 54s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 17s
Builds (macos-14, aarch64-apple-darwin, yes)	54s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 46s
Builds (windows-latest, x86_64-pc-windows-msvc)	5m 13s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 39s
	1h 30m 0s

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