impl(o11y): introduce gcp.client.version (#4140) #13130

Job	Run time
build(8) for gapic-generator-java	10m 40s
build(8) for showcase	8m 46s
build(21) except self-service clients	13m 26s
compatibility	1m 38s
build(25) except self-service clients	12m 50s
lint	1m 2s
build(8) except for gapic-generator-java	4m 42s
build (17)	14m 17s
build (11)	14m 15s
unmanaged_dependency_check	8m 26s
gapic-generator-java-bom	2m 13s
showcase (21)	10m 34s
showcase (17)	10m 36s
dependency_analyzer_unit_test	18s
showcase (11)	10m 45s
showcase (25)	10m 20s
showcase-clirr	0s
	2h 14m 48s

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