API Replace Extension subclasses #1547

Job	Run time
CI / Context	1s
CI / Generate matrix	23s
CI / Check governance	0s
CI / 8.3 prf-low mysql57 phpunit all	2m 39s
CI / 8.3 mariadb phpunit all	2m 34s
CI / 8.3 mysql57 phplinting	2m 40s
CI / 8.3 mysql57 endtoend root job1	10m 21s
CI / 8.3 mysql80 endtoend root job1	11m 13s
CI / 8.3 mysql57 endtoend root job2	8m 6s
CI / 8.3 mysql80 endtoend root job2	8m 23s
CI / 8.3 mysql57 endtoend root job3	9m 15s
CI / 8.3 mysql80 endtoend root job3	8m 43s
CI / 8.3 mysql57 js	7m 1s
CI / Dispatch tag patch release	0s
	1h 11m 19s

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