refactor: simplify and optimize handleRequest method in CodeIgniter #15859

Job	Run time
Setup PHP Version for Code Coverage	4s
Others (8.3) / Sanity Tests	2m 7s
Others (8.5) / Sanity Tests	2m 1s
Others (8.4) / Sanity Tests	1m 23s
Others (8.2) / Sanity Tests	1m 48s
SeparateProcess	0s
CacheLive	-1s
Upload coverage results to Coveralls	-1s
DatabaseLive	-1s
	7m 20s

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