REST API: Optimize total count queries in controllers #13192

Job	Run time
Core running from build / Core running from build / Linux	2m 14s
Core running from src / Core running from src / Linux	2m 3s
Core running from build / Core running from build / Windows	4m 13s
Core running from src / Core running from src / Windows	4m 7s
Core running from build / Core running from build / MacOS	1m 47s
Core running from src / Core running from src / MacOS	1m 46s
Gutenberg running from build / Gutenberg running from build / Linux	8m 39s
Gutenberg running from src / Gutenberg running from src / Linux	8m 57s
Gutenberg running from build / Gutenberg running from build / Windows	12m 19s
Gutenberg running from src / Gutenberg running from src / Windows	13m 5s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 51s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 33s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 15m 34s

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