Change dhw_cm_switch to _dhw_allowed_modes/select_dhw_mode #6219

Job	Run time
Dependency	7s
Cache identify	8s
Shellcheck	5s
Prepare	8s
Ruff check and force	10s
Check commit	21s
Run pytest using Python 3.14	23s
Run pytest using Python 3.13	17s
Run mypy	0s
Process test coverage	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
Process test complexity	0s
	1m 39s

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