API Deprecate API that's changing in CMS 6 (#799) #602

Job	Run time
CI / Generate matrix	26s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit blog	2m 53s
CI / 8.2 mariadb phpunit blog	2m 36s
CI / 8.3 mysql80 phpunit blog	2m 17s
CI / 8.3 mysql84 phpunit blog	2m 43s
CI / 8.1 mysql57 phplinting	2m 22s
CI / 8.1 mysql57 endtoend root	3m 56s
CI / 8.3 mysql80 endtoend root	5m 49s
CI / 8.1 mysql57 js	4m 6s
CI / Dispatch tag patch release	1s
	27m 11s

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