API Replace Extension subclasses #855

Job	Run time
CI / Generate matrix	14s
CI / Context	1s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	3m 20s
CI / 8.3 mysql80 phpunit all	4m 1s
CI / 8.3 mysql80 phplinting	1m 48s
CI / 8.3 mysql80 endtoend root job1	8m 47s
CI / 8.3 mysql80 endtoend root job1	9m 27s
CI / 8.3 mysql80 endtoend root job2	5m 40s
CI / 8.3 mysql80 endtoend root job2	5m 59s
CI / 8.3 mysql80 endtoend root job3	6m 59s
CI / 8.3 mysql80 endtoend root job3	7m 8s
CI / 8.3 mysql80 js	4m 57s
CI / Dispatch tag patch release	0s
	58m 21s

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