ENH Call validate on form fields within form #2090

Job	Run time
CI / Generate matrix	9s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit framework-core	6m 14s
CI / 8.3 mysql80 phpunit framework-core	8m 22s
CI / 8.4 mysql84 phpunit framework-core	8m 10s
CI / 8.3 prf-low mariadb phpunit framework-orm	11m 39s
CI / 8.3 mysql80 phpunit framework-orm	12m 24s
CI / 8.4 mysql84 phpunit framework-orm	12m 14s
CI / 8.3 mysql80 phplinting	2m 20s
CI / 8.3 mysql80 phpunit framework-cache-only inmemorycache	1m 12s
CI / Dispatch tag patch release	0s
	1h 2m 46s

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