impl(o11y): introduce error attributes #516

Job	Run time
filter	1m 9s
build(21) except self-service clients	12m 43s
build(25) except self-service clients	12m 43s
build(8) except for gapic-generator-java	3m 56s
gapic-generator-java-bom	2m 43s
build(8) for gapic-generator-java	10m 50s
build (17)	13m 17s
build (11)	13m 42s
showcase-clirr	5m 12s
dependency_analyzer_unit_test	1m 22s
build(8) for showcase	9m 48s
unmanaged_dependency_check	10m 45s
showcase (21)	9m 54s
showcase (17)	10m 14s
showcase (11)	10m 6s
showcase (25)	10m 7s
	2h 18m 31s

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