fix: Clean up attributes for traces and metrics #17344

Job	Run time
gapic-bom	1m 41s
package_name_check	1m 2s
gitignore_correctness	1m 0s
owlbot-py	1m 9s
generate-readme	1m 5s
owlbot-yaml	1m 0s
root-pom	1m 41s
group_id_check_for_maps_libraries	7m 55s
	16m 33s

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