NEW SingleRecordAdmin class for editing one record at a time #1673

Job	Run time
CI / Context	1s
CI / Generate matrix	13s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	1m 56s
CI / 8.3 mysql80 phpunit all	2m 24s
CI / 8.3 mysql80 phplinting	1m 30s
CI / 8.3 mysql80 endtoend root job1	10m 25s
CI / 8.3 mysql80 endtoend root job2	9m 56s
CI / 8.3 mysql80 endtoend root job3	10m 23s
CI / 8.3 mysql80 js	5m 12s
CI / Dispatch tag patch release	0s
	42m 0s

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