API Make LinkFieldController a subclass of FormSchemaController #690

Job	Run time
ci / Generate matrix	13s
ci / Context	1s
ci / Check governance	0s
ci / 8.3 prf-low mariadb phpunit all	1m 58s
ci / 8.3 mysql80 phpunit all	1m 46s
ci / 8.3 mysql80 phplinting	1m 27s
ci / 8.3 mysql80 endtoend root job1	2m 11s
ci / 8.3 mysql80 endtoend root job2	2m 25s
ci / 8.3 mysql80 js	1m 28s
ci / 8.3 mysql80 doclinting	1m 54s
ci / Dispatch tag patch release	0s
	13m 23s

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