API Replace getCMSValidator with getCMSCompositeValidator (#1362) #871

Job	Run time
CI / Context	1s
CI / Generate matrix	17s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	3m 34s
CI / 8.3 mysql80 phpunit all	4m 33s
CI / 8.4 mysql84 phpunit all	4m 34s
CI / 8.3 mysql80 phplinting	1m 36s
CI / 8.3 mysql80 endtoend root	6m 20s
CI / 8.4 mysql84 endtoend root	5m 19s
CI / 8.3 mysql80 js	4m 16s
CI / 8.3 mysql80 doclinting	2m 35s
CI / Dispatch tag patch release	3s
	33m 9s

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