MNT Remove unused JS and CSS #1554

Job	Run time
CI / Context	1s
CI / Generate matrix	22s
CI / Check governance	0s
CI / 8.3 prf-low mariadb phpunit all	2m 6s
CI / 8.3 mysql80 phpunit all	2m 33s
CI / 8.3 mysql80 phplinting	1m 49s
CI / 8.3 mysql80 endtoend root job1	11m 16s
CI / 8.3 mysql80 endtoend root job1	10m 53s
CI / 8.3 mysql80 endtoend root job2	8m 40s
CI / 8.3 mysql80 endtoend root job2	9m 9s
CI / 8.3 mysql80 endtoend root job3	8m 58s
CI / 8.3 mysql80 endtoend root job3	8m 59s
CI / 8.3 mysql80 js	1h 3m 8s
CI / Dispatch tag patch release	0s
	2h 7m 54s

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