Fix conda environment discovery for child environments under `envs` folder #1171

Job	Run time
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 30s
Tests (macos-14, aarch64-apple-darwin, yes)	16m 16s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 0s
Tests (macos-latest, x86_64-apple-darwin, yes)	11m 32s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 27s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 7s
Builds (windows-latest, aarch64-pc-windows-msvc)	3m 54s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 2s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 21s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 25s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	4m 51s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 40s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 39s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 34s
Builds (macos-14, aarch64-apple-darwin, yes)	1m 58s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	4m 49s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	7m 5s
	1h 30m 10s

Provide feedback