ENH Remove code that had been retained for backwards compatibility (#… #1823

Job	Run time
CI / Context	1s
CI / Generate matrix	10s
CI / Check governance	1s
CI / 8.3 prf-low mariadb phpunit all	2m 8s
CI / 8.3 mysql80 phpunit all	2m 6s
CI / 8.4 mysql84 phpunit all	2m 31s
CI / 8.3 mysql80 phplinting	2m 3s
CI / 8.3 mysql80 endtoend root job1	12m 25s
CI / 8.4 mysql84 endtoend root job1	10m 39s
CI / 8.3 mysql80 endtoend root job2	9m 14s
CI / 8.4 mysql84 endtoend root job2	8m 40s
CI / 8.3 mysql80 endtoend root job3	10m 15s
CI / 8.4 mysql84 endtoend root job3	9m 1s
CI / 8.3 mysql80 js	4m 36s
CI / Dispatch tag patch release	1s
	1h 13m 51s

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