_get_groups(): simplify logic #6085

Job	Run time
Shellcheck	4s
Dependency	4s
Cache identify	5s
Prepare	8s
Ruff check and force	7s
Check commit	17s
Run pytest using Python 3.14	19s
Run pytest using Python 3.13	17s
Run mypy	13s
Process test coverage	11s
Build and publish Python 🐍 distributions 📦 to TestPyPI	10s
Process test complexity	11s
	2m 6s

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