feat: add apiVersion to x-goog headers #3019

Job	Run time
lint	31s
build	2m 29s
lib-tests (14.x, showcase)	1m 59s
lib-tests-esm (14.x, showcase)	2m 53s
lib-tests (14.x, kms)	1m 40s
lib-tests-esm (14.x, kms)	2m 28s
lib-tests-esm (14.x, translate)	2m 16s
lib-tests (14.x, translate)	1m 32s
lib-tests-esm (14.x, monitoring)	3m 17s
lib-tests (14.x, monitoring)	2m 29s
lib-tests-esm (14.x, dlp)	2m 50s
lib-tests (14.x, dlp)	2m 12s
lib-tests-esm (14.x, texttospeech)	2m 9s
lib-tests (14.x, texttospeech)	1m 27s
lib-tests (14.x, showcase-legacy)	1m 22s
lib-tests-esm (14.x, showcase-legacy)	2m 19s
lib-tests-esm (14.x, compute)	2m 9s
lib-tests (14.x, compute)	1m 24s
lib-tests-esm (14.x, logging)	3m 2s
lib-tests (14.x, logging)	2m 13s
	42m 41s

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