Improve symlink directory detection in environment finder #1271

Job	Run time
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	9m 1s
Tests (macos-latest, x86_64-apple-darwin, yes)	11m 20s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 28s
Tests (macos-14, aarch64-apple-darwin, yes)	8m 42s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 12s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	39s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 49s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 30s
Builds (macos-14, aarch64-apple-darwin, yes)	53s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 32s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	5m 56s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 47s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 24s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 45s
Builds (macos-latest, x86_64-apple-darwin, yes)	40s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	6m 21s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 52s
	1h 23m 51s

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