Real-time collaboration: Add new REST endpoints, setting, and registered post meta #32052

Job	Run time
Determine Matrix	3s
Multisite Default / Test current	14m 21s
Single Site Memcached / Test current	14m 23s
Multisite Memcached / Test current	14m 4s
Single Site Default / Test current	14m 11s
Compare / Single Site Default	25s
Compare / Multisite Memcached	27s
Compare / Multisite Default	17s
Compare / Single Site Memcached	17s
Slack Notifications	-1s
Failed workflow tasks	0s
	58m 27s

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