Enhance pyenv shims directory detection and add unit tests (#304) #1233

Job	Run time
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	8m 24s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 13s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 41s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 18s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	1m 56s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 31s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 27s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 11s
Tests (macos-latest, x86_64-apple-darwin, yes)	14m 7s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 17s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 51s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	7m 8s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	10m 29s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 52s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	5m 17s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 46s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 16s
	1h 33m 44s

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