Use offsets from `.bgv` file to select appropriate text #20990

Job	Run time
/substratevm on Windows	8m 28s
/compiler style,fullbuild,test JDK21	32m 11s
/compiler build,bootstraplite JDKlatest	5m 9s
/espresso style,fullbuild JDK21	13m 30s
/substratevm style,fullbuild JDKlatest	12m 27s
/substratevm build,helloworld,native_unittests JDKlatest	20m 23s
/substratevm build,debuginfotest JDKlatest	22m 35s
/substratevm hellomodule JDKlatest	4m 36s
/sulong style,fullbuild,sulongBasic JDK21	20m 5s
/truffle JDK21	31m 1s
/vm build,sulong JDKlatest	26m 35s
/vm build JDKlatest	15m 54s
	3h 32m 54s

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