API Add ValidationInterface to Form #3521

Job	Run time
CI / Generate matrix	12s
CI / Context	1s
CI / 8.3 prf-low mariadb phpunit framework-core	5m 55s
CI / Check governance	0s
CI / 8.3 mysql80 phpunit framework-core	8m 9s
CI / 8.4 mysql84 phpunit framework-core	7m 33s
CI / 8.3 prf-low mariadb phpunit framework-orm	11m 55s
CI / 8.3 mysql80 phpunit framework-orm	13m 23s
CI / 8.4 mysql84 phpunit framework-orm	13m 10s
CI / 8.3 mysql80 phplinting	2m 33s
CI / 8.3 mysql80 phpunit framework-cache-only inmemorycache	1m 26s
CI / Dispatch tag patch release	0s
	1h 4m 17s

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