Ensure comments REST controller returns note type children #21844

Job	Run time
Core running from build / Windows	5m 46s
Core running from src / MacOS	3m 12s
Core running from src / Windows	4m 23s
Core running from build / MacOS	3m 18s
Core running from build / Linux	2m 43s
Core running from src / Linux	2m 42s
Gutenberg running from build / Linux	7m 55s
Gutenberg running from build / MacOS	8m 26s
Gutenberg running from src / MacOS	12m 0s
Gutenberg running from src / Linux	8m 28s
Gutenberg running from src / Windows	12m 25s
Gutenberg running from build / Windows	12m 48s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 24m 6s

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