Improvements to tool test error handling. #30037

Job	Run time
build-client / build-client	9m 23s
setup-selenium / setup_chromedriver	7s
Test (3.8, 0)	42m 22s
Test (3.8, 1)	53m 38s
Test (3.8, 2)	51m 58s
	2h 37m 28s

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