API Replace getCMSValidator with getCMSCompositeValidator #870

Job	Run time
CI / Generate matrix	11s
CI / Context	1s
CI / 8.3 prf-low mariadb phpunit all	3m 41s
CI / 8.3 mysql80 phpunit all	4m 29s
CI / 8.4 mysql84 phpunit all	4m 17s
CI / Check governance	0s
CI / 8.3 mysql80 phplinting	1m 45s
CI / 8.3 mysql80 endtoend root	6m 2s
CI / 8.4 mysql84 endtoend root	5m 25s
CI / 8.3 mysql80 js	3m 46s
CI / 8.3 mysql80 doclinting	2m 33s
CI / Dispatch tag patch release	0s
	32m 10s

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