REST API: Support nested _fields in revisions controller #33437

Job	Run time
Determine Matrix	3s
Single Site Default / Test current	12m 23s
Multisite Default / Test current	12m 24s
Multisite Default / Test before	12m 47s
Multisite Memcached / Test current	12m 24s
Single Site Memcached / Test current	12m 25s
Single Site Memcached / Test before	12m 14s
Single Site Default / Test before	12m 24s
Multisite Memcached / Test before	13m 5s
Compare / Multisite Memcached	17s
Compare / Multisite Default	12s
Compare / Single Site Default	18s
Compare / Single Site Memcached	11s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 41m 7s

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