[HttpKernel] Auto-register kernel as an extension #38243
Merged
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Symfony already supports having the kernel as an extension. This is evident by the fact that the
config:dump-reference
anddebug:config
commands check whether the kernel implements theExtensionInterface
. Nonetheless, it's still required to register the kernel manually as an extension.With this PR the kernel will be automatically registered as an extension if it implements the
ExtensionInterface
. This is the same logic as when the kernel implements theCompilerPassInterface
.