Improvements for K8S deployment (especially ITs) #28279

Job	Run time
build-client / build-client	8m 59s
setup-selenium / setup_chromedriver	9s
Test (3.8, 0)	40m 30s
Test (3.8, 1)	51m 4s
Test (3.8, 2)	48m 49s
	2h 29m 31s

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