fix(o11y): composite tracer to process url changes #19042

Job	Run time
changes	3s
lint	3m 25s
generation-config-check	1m 51s
gapic-libraries-bom	17m 30s
enforcer	18m 42s
windows	2m 29s
bulk-filter	1m 11s
split-units (sdk-platform-java, 8)	3m 5s
split-units (sdk-platform-java, 17)	6m 3s
split-units (sdk-platform-java, 25)	6m 40s
split-units (sdk-platform-java, 11)	8m 1s
split-units (sdk-platform-java, 21)	6m 8s
units (8)	34m 6s
units (25)	32m 9s
units (11)	34m 28s
units (21)	31m 37s
units (17)	25m 46s
	3h 53m 14s

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