Merge pull request #17863 from jmchilton/update-label-markdown-editor #858

Job	Run time
build-client / build-client	11m 42s
setup-selenium / setup_chromedriver	4s
Test (3.8, 0)	45m 13s
Test (3.8, 1)	54m 16s
Test (3.8, 2)	50m 22s
	2h 41m 37s

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