CORE-163 end support of googleServiceAccount field #614

Job	Run time
build	6m 15s
build	2m 16s
jib	1m 7s
jib	53s
unit-tests	1m 39s
unit-tests	1m 35s
integration-tests	1m 12s
integration-tests	1m 12s
source-clear	5m 8s
source-clear	37s
dispatch-tag	0s
dispatch-tag	0s
notify-slack-on-failure / notify-slack	0s
notify-slack-on-failure	0s
	21m 54s

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