Enhance symlink handling in create_unknown_env for Windows compatibility #1182

Job	Run time
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 34s
Tests (macos-14, aarch64-apple-darwin, yes)	12m 22s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 52s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 52s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 10s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 34s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 22s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 32s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 35s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 4s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 11s
Tests (macos-latest, x86_64-apple-darwin, yes)	15m 46s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 0s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 14s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 4s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 29s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 26s
	1h 33m 7s

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