_get_groups(): simplify logic #6084

Job	Run time
Cache identify	5s
Dependency	5s
Shellcheck	4s
Prepare	8s
Ruff check and force	8s
Check commit	19s
Run pytest using Python 3.13	15s
Run pytest using Python 3.14	16s
Run mypy	16s
Process test coverage	13s
Build and publish Python 🐍 distributions 📦 to TestPyPI	10s
Process test complexity	7s
	2m 6s

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