impl(o11y): introduce `url.full` #18270

Job	Run time
units (11)	40m 26s
generation-config-check	1m 42s
units (8)	40m 17s
units (17)	32m 20s
changes	5s
units (25)	30m 16s
units (21)	31m 6s
lint	3m 20s
gapic-libraries-bom	22m 25s
windows	2m 18s
enforcer	23m 50s
split-units (sdk-platform-java, 8)	3m 50s
split-units (sdk-platform-java, 17)	8m 12s
split-units (sdk-platform-java, 25)	6m 44s
split-units (sdk-platform-java, 21)	6m 44s
split-units (sdk-platform-java, 11)	7m 52s
	4h 21m 27s

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