API Standardise extension hooks #928

Job	Run time
CI / Context	1s
CI / Generate matrix	40s
CI / Check governance	0s
CI / 8.3 prf-low mysql57 phpunit all	2m 6s
CI / 8.3 mariadb phpunit all	2m 2s
CI / 8.3 mysql57 phplinting	1m 58s
CI / 8.3 mysql57 endtoend root job1	10m 32s
CI / 8.3 mysql80 endtoend root job1	9m 29s
CI / 8.3 mysql57 endtoend root job2	8m 44s
CI / 8.3 mysql80 endtoend root job2	8m 25s
CI / 8.3 mysql57 endtoend root job3	7m 48s
CI / 8.3 mysql80 endtoend root job3	7m 40s
CI / 8.3 mysql57 js	5m 0s
CI / Dispatch tag patch release	0s
	1h 4m 25s

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