Improve conda environment name retrieval logic for external environments #1277

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 53s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 39s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	8m 14s
Tests (macos-14, aarch64-apple-darwin, yes)	12m 27s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 36s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 5s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 23s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 42s
Builds (windows-latest, aarch64-pc-windows-msvc)	6m 6s
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)	8m 8s
Builds (macos-latest, x86_64-apple-darwin, yes)	1m 13s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 11s
Builds (macos-14, aarch64-apple-darwin, yes)	45s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	35s
Tests (macos-latest, x86_64-apple-darwin, yes)	13m 42s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 20s
	1h 31m 53s

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