fix: Clean up attributes for traces and metrics #700

Job	Run time
filter	1m 3s
build(8) for showcase	9m 37s
unmanaged_dependency_check	9m 45s
build (11)	13m 30s
build(8) except for gapic-generator-java	4m 10s
build(25) except self-service clients	12m 23s
build(8) for gapic-generator-java	11m 38s
build (17)	13m 26s
build(21) except self-service clients	12m 25s
showcase (17)	10m 53s
showcase-clirr	5m 59s
showcase (11)	10m 20s
dependency_analyzer_unit_test	1m 21s
showcase (25)	10m 13s
gapic-generator-java-bom	2m 12s
showcase (21)	10m 34s
	2h 19m 29s

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