API Use updated FormField::validate() signature #1021

Job	Run time
CI / Context	1s
CI / Generate matrix	19s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	1m 46s
CI / 8.3 mysql80 phpunit all	1m 55s
CI / 8.3 mysql84 phpunit all	1m 31s
CI / 8.3 mysql80 phplinting	1m 37s
CI / 8.3 mysql80 endtoend root job1	3m 3s
CI / 8.3 mysql80 endtoend root job2	2m 36s
CI / 8.3 mysql80 endtoend root job3	2m 27s
CI / 8.3 mysql80 js	1m 29s
CI / Dispatch tag patch release	0s
	16m 44s

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