[HttpKernel] Only remove E_WARNING from error level during kernel init
#59975
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This fixes #59139 as mentioned in #59139 (comment).
With PHP 8.4 there can currently be a huge console output spam showing the
deprecation, depending on your installed packages. This is caused by the kernel completely overriding the PHP error level within
initializeContainer(), which will cause everything to be shown (except warnings) that is triggered duringinclude.The kernel should always adhere to the
error_reportinglevel set by the environment - thus this PR fixes this issue by only removing theE_WARNINGlevel from theerror_reportinglevel when trying to silence the include failures while including the cache path during kernel init.