fix: Clean up attributes for traces and metrics #695

Job	Run time
filter	1m 0s
build(8) except for gapic-generator-java	4m 1s
build(21) except self-service clients	12m 58s
build (11)	13m 46s
build(8) for showcase	9m 40s
build (17)	15m 57s
showcase-clirr	5m 48s
build(8) for gapic-generator-java	11m 8s
gapic-generator-java-bom	2m 16s
build(25) except self-service clients	12m 23s
showcase (17)	11m 5s
showcase (21)	10m 12s
showcase (11)	10m 28s
dependency_analyzer_unit_test	1m 25s
unmanaged_dependency_check	10m 29s
showcase (25)	11m 5s
	2h 23m 41s

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