refactor: prepend `Autoloader`'s own autoload functions #14653

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.4) / Sanity Tests	2m 29s
Others (8.5) / Sanity Tests	2m 46s
Others (8.2) / Sanity Tests	4m 18s
Others (8.3) / Sanity Tests	20m 44s
SeparateProcess	0s
CacheLive	0s
DatabaseLive	0s
Upload coverage results to Coveralls	0s
	30m 20s

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