Move heatmap visualization to new script endpoint #30572

Job	Run time
setup-selenium / setup_chromedriver	4s
build-client / build-client	9m 35s
Test (3.8, 0)	36m 49s
Test (3.8, 1)	48m 59s
Test (3.8, 2)	43m 32s
	2h 18m 59s

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