Core: make shlex split an attempt with regular split retry (#4046) #20395

Job	Run time
Test hosting with 3.12 on ubuntu-latest	3m 10s
Test Python 3.8 ubuntu-latest	4m 21s
Test Python 3.9 ubuntu-latest	4m 50s
Test Python 3.10 ubuntu-latest	4m 14s
Test Python 3.11 ubuntu-latest	4m 13s
Test Python 3.12 ubuntu-latest	5m 55s
Test Python 3.8 windows-latest	5m 56s
Test Python 3.12 windows-latest	7m 55s
Test Python 3.12 macos-latest	4m 2s
	44m 36s

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