Play: Add various HTML API utilities and debuggers. #9913

Job	Run time
Core running from src / Core running from src / Linux	1m 57s
Core running from build / Core running from build / Linux	1m 58s
Core running from build / Core running from build / Windows	3m 15s
Core running from src / Core running from src / Windows	3m 5s
Core running from build / Core running from build / MacOS	1m 59s
Core running from src / Core running from src / MacOS	2m 1s
Gutenberg running from build / Gutenberg running from build / Linux	8m 35s
Gutenberg running from src / Gutenberg running from src / Linux	8m 31s
Gutenberg running from build / Gutenberg running from build / Windows	11m 5s
Gutenberg running from src / Gutenberg running from src / Windows	11m 5s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 11s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 41s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 11m 23s

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