Core: change start inventory from pool to warn when nothing to remove… #18948

Job	Run time
Test hosting with 3.11 on ubuntu-latest	3m 4s
Test Python 3.8 ubuntu-latest	3m 35s
Test Python 3.9 ubuntu-latest	3m 29s
Test Python 3.10 ubuntu-latest	3m 30s
Test Python 3.11 ubuntu-latest	3m 33s
Test Python 3.8 windows-latest	4m 22s
Test Python 3.11 windows-latest	6m 10s
Test Python 3.11 macos-latest	1m 49s
	29m 32s

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