Syntax for conditionally loading toolbox items. #26439

Job	Run time
setup-selenium / setup_chromedriver	4s
build-client / build-client	11m 7s
Test (3.8, 0)	44m 33s
Test (3.8, 1)	58m 0s
Test (3.8, 2)	54m 26s
	2h 48m 10s

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