chore: re-enable HW processing for hermetic build scripts #5452

Job	Run time
build (11)	12m 10s
build(21) except self-service clients	10m 54s
build (17)	11m 44s
build(8) except for gapic-generator-java	3m 49s
build(8) for gapic-generator-java	9m 56s
compatibility	1m 51s
gapic-generator-java-bom	2m 5s
lint	21s
showcase (11)	3m 40s
showcase-clirr	2m 56s
showcase (17)	3m 50s
showcase-native	7m 29s
unmanaged_dependency_check	3m 43s
	1h 14m 28s

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