impl(o11y): introduce error attributes #256

Job	Run time
filter	50s
build (11)	13m 29s
build(8) except for gapic-generator-java	3m 50s
showcase (25)	8m 54s
build(8) for showcase	5m 21s
build(21) except self-service clients	12m 3s
showcase (17)	8m 54s
gapic-generator-java-bom	2m 18s
build(8) for gapic-generator-java	11m 28s
showcase (21)	9m 6s
dependency_analyzer_unit_test	1m 28s
unmanaged_dependency_check	8m 36s
showcase (11)	8m 31s
build (17)	12m 53s
showcase-clirr	5m 13s
build(25) except self-service clients	12m 22s
	2h 5m 16s

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