Add test for schedule = "off" #5834

Job	Run time
Cache identify	14s
Dependency	4s
Shellcheck	6s
Prepare	17s
Ruff check and force	18s
Check commit	29s
Run pytest using Python 3.13	17s
Run pytest using Python 3.14	25s
Run mypy	22s
Process test coverage	30s
Process test complexity	23s
Build and publish Python 🐍 distributions 📦 to TestPyPI	13s
	3m 38s

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