API Provide a way to register link forms dynamically for ModalController #944

Job	Run time
CI / Context	1s
CI / Generate matrix	11s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 24s
CI / 8.3 mysql80 phpunit all	2m 19s
CI / 8.3 mysql84 phpunit all	2m 34s
CI / 8.3 mysql80 phplinting	2m 24s
CI / 8.3 mysql80 endtoend root job1	10m 41s
CI / 8.3 mysql80 endtoend root job2	8m 18s
CI / 8.3 mysql80 endtoend root job3	9m 4s
CI / 8.3 mysql80 js	5m 31s
CI / Dispatch tag patch release	0s
	43m 28s

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