fix: Clean up attributes for traces and metrics #701

Job	Run time
filter	1m 3s
build(8) for showcase	9m 46s
build(8) for gapic-generator-java	11m 30s
build (11)	13m 39s
build(8) except for gapic-generator-java	4m 8s
build (17)	13m 42s
build(25) except self-service clients	11m 59s
build(21) except self-service clients	9m 56s
showcase-clirr	5m 26s
showcase (25)	10m 35s
dependency_analyzer_unit_test	1m 20s
showcase (21)	10m 48s
unmanaged_dependency_check	6m 53s
showcase (17)	10m 17s
showcase (11)	10m 29s
gapic-generator-java-bom	2m 0s
	2h 13m 31s

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