API Provide a way to register link forms dynamically for ModalController #948

Job	Run time
CI / Context	1s
CI / Generate matrix	14s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 23s
CI / 8.3 mysql80 phpunit all	2m 22s
CI / 8.3 mysql84 phpunit all	2m 28s
CI / 8.3 mysql80 phplinting	1m 55s
CI / 8.3 mysql80 endtoend root job1	10m 34s
CI / 8.3 mysql80 endtoend root job2	8m 38s
CI / 8.3 mysql80 endtoend root job3	8m 57s
CI / 8.3 mysql80 js	5m 33s
CI / Dispatch tag patch release	1s
	43m 7s

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