HTML API: Use full parser for html5lib tests #8620

Job	Run time
Core running from build / Core running from build / Linux	2m 2s
Core running from build / Core running from build / Windows	4m 13s
Core running from src / Core running from src / Linux	1m 49s
Core running from src / Core running from src / Windows	4m 21s
Core running from build / Core running from build / MacOS	2m 3s
Core running from src / Core running from src / MacOS	2m 3s
Gutenberg running from build / Gutenberg running from build / Linux	7m 49s
Gutenberg running from src / Gutenberg running from src / Linux	7m 59s
Gutenberg running from build / Gutenberg running from build / Windows	11m 13s
Gutenberg running from src / Gutenberg running from src / Windows	12m 2s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 45s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 36s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 10m 55s

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