RTC: Remove post list lock icon and replace user-specific lock text when RTC is enabled #27964

Job	Run time
Core running from src / Linux	1m 48s
Core running from build / Linux	1m 59s
Core running from src / MacOS	1m 36s
Core running from src / Windows	3m 38s
Core running from build / Windows	4m 16s
Core running from build / MacOS	1m 19s
Slack Notifications	0s
Failed workflow tasks	0s
	14m 36s

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