Fix directory filtering in environment search functions #1153

Job	Run time
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 34s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 47s
Tests (macos-14, aarch64-apple-darwin, yes)	9m 39s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 32s
Tests (macos-latest, x86_64-apple-darwin, yes)	10m 13s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 35s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 32s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 31s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 56s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 33s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 18s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 59s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 13s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 57s
Builds (macos-latest, x86_64-apple-darwin, yes)	3m 29s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 34s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 25s
	1h 23m 47s

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