Fix pipenv environment detection with centralized directory support #1252

Job	Run time
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 39s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 44s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 41s
Builds (windows-latest, x86_64-pc-windows-msvc)	5m 8s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 56s
Tests (macos-latest, x86_64-apple-darwin, yes)	15m 57s
Builds (macos-latest, x86_64-apple-darwin, yes)	4m 35s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 14s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 53s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	9m 7s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 46s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 5s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 48s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 47s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 6s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 25s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	7m 36s
	1h 40m 27s

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