Enable RTC by default, redo. #26814

Job	Run time
Core running from build / MacOS	4m 17s
Core running from build / Windows	12m 12s
Core running from src / Windows	7m 33s
Core running from src / Linux	4m 7s
Core running from build / Linux	4m 25s
Core running from src / MacOS	6m 4s
Slack Notifications	0s
Failed workflow tasks	0s
	38m 38s

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