Use offsets from `.bgv` file to select appropriate text #21365

Job	Run time
/substratevm on Windows	8m 30s
/compiler style,fullbuild,test JDKlatest	34m 30s
/compiler build,bootstraplite JDKlatest	4m 14s
/espresso style,fullbuild JDK21	13m 27s
/substratevm style,fullbuild JDKlatest	11m 49s
/substratevm build,helloworld,native_unittests JDKlatest	20m 39s
/substratevm build,debuginfotest JDKlatest	22m 17s
/substratevm hellomodule JDKlatest	4m 56s
/sulong style,fullbuild,sulongBasic JDK21	20m 12s
/truffle JDK21	31m 52s
/vm build,sulong JDKlatest	28m 26s
/vm build JDKlatest	15m 57s
	3h 36m 49s

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