HTML API: Add get full comment text method #9961

Job	Run time
Core running from build / Core running from build / Linux	2m 6s
Core running from src / Core running from src / Linux	1m 54s
Core running from build / Core running from build / Windows	3m 49s
Core running from src / Core running from src / Windows	4m 7s
Core running from build / Core running from build / MacOS	1m 44s
Core running from src / Core running from src / MacOS	1m 53s
Gutenberg running from build / Gutenberg running from build / Linux	8m 32s
Gutenberg running from src / Gutenberg running from src / Linux	8m 48s
Gutenberg running from build / Gutenberg running from build / Windows	12m 55s
Gutenberg running from src / Gutenberg running from src / Windows	12m 7s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 1s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 48s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 44s

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