API Use updated FormField::validate() signature #1027

Job	Run time
CI / Generate matrix	19s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 6s
CI / 8.3 mysql80 phpunit all	1m 34s
CI / 8.3 mysql84 phpunit all	1m 33s
CI / 8.3 mysql80 phplinting	1m 57s
CI / 8.3 mysql80 endtoend root job1	2m 44s
CI / 8.3 mysql80 endtoend root job2	2m 43s
CI / 8.3 mysql80 endtoend root job3	2m 28s
CI / 8.3 mysql80 js	1m 49s
CI / Dispatch tag patch release	0s
	17m 14s

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