Break out _create_special_dicts() as common function #6297

Job	Run time
Cache identify	4s
Shellcheck	6s
Dependency	8s
Prepare	6s
Ruff check and force	7s
Check commit	22s
Run pytest using Python 3.14	24s
Run pytest using Python 3.13	18s
Run mypy	14s
Process test coverage	14s
Process test complexity	11s
Build and publish Python 🐍 distributions 📦 to TestPyPI	8s
	2m 22s

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