[googleapis_auth] Support impersonated_service_account in ADC #94

Job	Run time
health / unused-dependencies / run unused-dependencies health check	50s
health / breaking / run breaking health check	1m 2s
health / changelog / run changelog health check	50s
health / license / run license health check	53s
health / leaking / run leaking health check	49s
health / do-not-submit / run do-not-submit health check	49s
health / coverage	-1s
health / comment	6s
	5m 18s

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