Add hint to the tool schema about runtime conditional changes #29765

Job	Run time
build-client / build-client	9m 13s
setup-selenium / setup_chromedriver	4s
Test (3.8, 0)	41m 25s
Test (3.8, 1)	53m 40s
Test (3.8, 2)	49m 26s
	2h 33m 48s

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