[GR-53657] Simplify rerunning subprocess based unit tests. #17354

Job	Run time
/substratevm on Windows	8m 38s
/compiler style,fullbuild,test JDK21	26m 33s
/compiler build,bootstraplite JDKlatest	4m 32s
/espresso style,fullbuild JDK21	12m 10s
/substratevm style,fullbuild JDK21	10m 15s
/substratevm build,helloworld,native_unittests JDKlatest	20m 8s
/substratevm build,debuginfotest JDKlatest	11m 3s
/substratevm hellomodule JDKlatest	4m 44s
/sulong style,fullbuild,sulongBasic JDK21	18m 23s
/truffle JDK21	19m 34s
/vm build,sulong JDKlatest	25m 32s
/vm build JDKlatest	16m 9s
	2h 57m 41s

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