impl(o11y): introduce error attributes #429

Job	Run time
filter	1m 3s
build(8) except for gapic-generator-java	1m 53s
build(8) for showcase	9m 38s
build(21) except self-service clients	1m 53s
build(8) for gapic-generator-java	11m 5s
unmanaged_dependency_check	9m 27s
dependency_analyzer_unit_test	1m 26s
build (17)	1m 46s
showcase-clirr	5m 49s
gapic-generator-java-bom	2m 37s
showcase (21)	10m 33s
build (11)	1m 49s
build(25) except self-service clients	1m 48s
showcase (25)	9m 37s
showcase (17)	10m 18s
showcase (11)	10m 8s
	1h 30m 50s

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