Merge pull request #21398 from guerler/azure_flat_fs #1803

Job	Run time
setup-selenium / setup_chromedriver	8s
build-client / build-client	4m 47s
Test (3.9, 0)	44m 49s
Test (3.9, 2)	50m 7s
Test (3.9, 1)	50m 31s
	2h 30m 22s

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