fix(o11y): composite tracer to process url changes #873

Job	Run time
filter	1m 1s
downstream-compatibility-spring-generator	11m 20s
downstream-compatibility (java-pubsub)	4m 30s
downstream-compatibility (java-pubsublite)	4m 27s
downstream-compatibility (java-bigtable)	9m 52s
downstream-compatibility (java-firestore)	4m 6s
	35m 16s

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