Add existing/new detection in _get_locations() and related #5990

Job	Run time
Cache identify	5s
Dependency	4s
Shellcheck	6s
Prepare	11s
Ruff check and force	11s
Check commit	20s
Run pytest using Python ${{ matrix.python-version }}	-1s
Run mypy	-1s
Process test coverage	0s
Process test complexity	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
	55s

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