API Provide a way to register link forms dynamically for ModalController #943

Job	Run time
CI / Generate matrix	12s
CI / Context	1s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 49s
CI / 8.3 mysql80 phpunit all	2m 27s
CI / 8.3 mysql84 phpunit all	2m 28s
CI / 8.3 mysql80 phplinting	2m 17s
CI / 8.3 mysql80 endtoend root job1	10m 29s
CI / 8.3 mysql80 endtoend root job2	8m 46s
CI / 8.3 mysql80 endtoend root job3	9m 32s
CI / 8.3 mysql80 js	5m 15s
CI / Dispatch tag patch release	0s
	44m 17s

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