API Replace Extension subclasses #1011

Job	Run time
CI / Context	1s
CI / Generate matrix	15s
CI / 8.1 prf-low mysql57 phpunit all	1m 37s
CI / 8.2 mariadb phpunit all	1m 26s
CI / Check governance	0s
CI / 8.3 mysql80 phpunit all	1m 19s
CI / 8.1 mysql57 phplinting	59s
CI / 8.1 mysql57 endtoend root job1	1m 40s
CI / 8.3 mysql80 endtoend root job1	2m 16s
CI / 8.1 mysql57 endtoend root job2	1m 44s
CI / 8.3 mysql80 endtoend root job2	2m 37s
CI / 8.1 mysql57 endtoend root job3	1m 38s
CI / 8.3 mysql80 endtoend root job3	2m 32s
CI / 8.1 mysql57 endtoend root job4	1m 57s
CI / 8.3 mysql80 endtoend root job4	2m 20s
CI / 8.1 mysql57 endtoend root job5	1m 39s
CI / 8.3 mysql80 endtoend root job5	2m 32s
CI / 8.1 mysql57 endtoend root job6	1m 40s
CI / 8.3 mysql80 endtoend root job6	2m 31s
CI / 8.1 mysql57 endtoend root job7	1m 44s
CI / 8.3 mysql80 endtoend root job7	2m 40s
CI / 8.1 mysql57 js	1m 0s
CI / 8.1 mysql57 doclinting	1m 14s
CI / Dispatch tag patch release	0s
	37m 21s

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