WIP: Add HTML templating #22875

Job	Run time
Core running from build / MacOS	3m 52s
Core running from src / MacOS	3m 29s
Core running from src / Windows	4m 33s
Core running from build / Linux	2m 56s
Core running from src / Linux	2m 26s
Gutenberg running from src / MacOS	23m 18s
Gutenberg running from build / MacOS	15m 44s
Core running from build / Windows	5m 7s
Gutenberg running from src / Linux	8m 45s
Gutenberg running from build / Windows	12m 50s
Gutenberg running from src / Windows	12m 49s
Gutenberg running from build / Linux	8m 47s
Failed workflow tasks	0s
Slack Notifications	0s
	1h 44m 36s

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