fix: typings for headers and tests #3511

Job	Run time
build	6m 17s
lint	33s
lib-tests-esm (14.x, showcase)	54s
lib-tests-esm (14.x, kms)	51s
lib-tests (14.x, showcase)	49s
lib-tests-esm (14.x, translate)	49s
lib-tests (14.x, kms)	47s
lib-tests-esm (14.x, monitoring)	54s
lib-tests-esm (14.x, dlp)	55s
lib-tests (14.x, translate)	49s
lib-tests (14.x, monitoring)	50s
lib-tests-esm (14.x, texttospeech)	50s
lib-tests (14.x, dlp)	47s
lib-tests-esm (14.x, showcase-legacy)	49s
lib-tests (14.x, texttospeech)	50s
lib-tests-esm (14.x, compute)	53s
lib-tests (14.x, showcase-legacy)	45s
lib-tests-esm (14.x, logging)	55s
lib-tests (14.x, compute)	47s
lib-tests-esm (14.x, bigquery-v2)	56s
lib-tests (14.x, logging)	45s
lib-tests-esm (14.x, redis)	41s
lib-tests (14.x, bigquery-v2)	51s
lib-tests (14.x, redis)	35s
	24m 52s

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