[Sets] Drop DoctrineSetProvider and TwigSetProvider from the collector

[TomasVotruba]

Follows up on #8295 (PHPUnitSetProvider) and #8292 (Symfony per-version set providers) - removes the DoctrineSetProvider and TwigSetProvider registrations from SetProviderCollector, leaving only the core PHP/Core providers.

 use Rector\Set\Contract\SetInterface;
 use Rector\Set\Contract\SetProviderInterface;
 use Rector\Set\SetProvider\CoreSetProvider;
 use Rector\Set\SetProvider\PHPSetProvider;
 use Rector\Set\ValueObject\ComposerTriggeredSet;
-use Rector\Doctrine\Set\SetProvider\DoctrineSetProvider;
-use Rector\Symfony\Set\SetProvider\TwigSetProvider;

 ...

         $setProviders = [
             // register all known set providers here
             new PHPSetProvider(),
             new CoreSetProvider(),
-            new DoctrineSetProvider(),
-            new TwigSetProvider(),
         ];

Providers can still be passed in via the $extraSetProviders constructor argument - that is how RectorConfigBuilder::__invoke() already wires user-registered providers, and how SetManagerTest now supplies TwigSetProvider.