API Make HistoryViewerController a subclass of FormSchemaController (… #614

Job	Run time
CI / Context	1s
CI / Generate matrix	13s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 11s
CI / 8.3 mysql80 phpunit all	2m 31s
CI / 8.3 mysql84 phpunit all	2m 32s
CI / 8.3 mysql80 phplinting	1m 45s
CI / 8.3 mysql80 endtoend root job1	6m 46s
CI / 8.3 mysql80 endtoend root job2	5m 56s
CI / 8.3 mysql80 js	4m 19s
CI / Dispatch tag patch release	7s
	26m 22s

Provide feedback