Remove double setting of _is_running #3368

Job	Run time
Shellcheck	5s
Dependency	5s
Cache identify	4s
Prepare	7s
Ruff check and force	10s
Check commit	40s
Run pytest using Python 3.14	32s
Process test coverage	11s
Run mypy	-1s
Process test complexity	10s
Build and publish Python 🐍 distributions 📦 to TestPyPI	9s
	2m 12s

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