NEW Move form schema logic into FormSchemaController #1684

Job	Run time
CI / Generate matrix	16s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 0s
CI / 8.3 mysql80 phpunit all	2m 36s
CI / 8.3 mysql80 phplinting	1m 42s
CI / 8.3 mysql80 endtoend root job1	10m 14s
CI / 8.3 mysql80 endtoend root job2	7m 57s
CI / 8.3 mysql80 endtoend root job3	8m 36s
CI / 8.3 mysql80 js	5m 23s
CI / Dispatch tag patch release	0s
	38m 45s

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