refactor: prepend `Autoloader`'s own autoload functions #14671

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.3) / Sanity Tests	2m 48s
Others (8.5) / Sanity Tests	2m 36s
Others (8.2) / Sanity Tests	9m 54s
Others (8.4) / Sanity Tests	2m 52s
SeparateProcess	0s
CacheLive	0s
DatabaseLive	0s
Upload coverage results to Coveralls	0s
	18m 13s

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