Remove dead SetManager and setGroups plumbing

With set providers gone, group matching always yielded nothing. Drop
SetManager, the setGroups/groupLoadedSets fields and the composer-based
set-group fallback; withComposerBased() now only loads defined set-list
constants.

Claude-Session: https://claude.ai/code/session_015hE4UdetizXAUwE7JKZHX7

Author: TomasVotruba

src/Configuration/RectorConfigBuilder.php

@@ -25,7 +25,6 @@
 use Rector\Php\PhpVersionResolver\ComposerJsonPhpVersionResolver;
 use Rector\PHPUnit\Set\PHPUnitSetList;
 use Rector\Set\Enum\SetGroup;
-use Rector\Set\SetManager;
 use Rector\Set\ValueObject\DowngradeLevelSetList;
 use Rector\Set\ValueObject\SetList;
 use Rector\Symfony\Set\SymfonyInternalSetList;
@@ -172,20 +171,10 @@ final class RectorConfigBuilder
      */
     private array $registerServices = [];
 
-    /**
-     * @var array<SetGroup::*>
-     */
-    private array $setGroups = [];
-
     private ?bool $reportingRealPath = null;
 
     private ?bool $reportUnusedSkips = null;
 
-    /**
-     * @var string[]
-     */
-    private array $groupLoadedSets = [];
-
     private ?string $editorUrl = null;
 
     private ?bool $isWithPhpSetsUsed = null;
@@ -201,14 +190,6 @@ final class RectorConfigBuilder
 
     public function __invoke(RectorConfig $rectorConfig): void
     {
-        if ($this->setGroups !== []) {
-            $setManager = new SetManager();
-
-            $this->groupLoadedSets = $setManager->matchBySetGroups();
-
-            SimpleParameterProvider::addParameter(Option::COMPOSER_BASED_SETS, $this->groupLoadedSets);
-        }
-
         // not to miss it by accident
         if ($this->isWithPhpSetsUsed === true) {
             $this->sets[] = SetList::PHP_POLYFILLS;
@@ -221,9 +202,6 @@ public function __invoke(RectorConfig $rectorConfig): void
             );
         }
 
-        // merge sets together
-        $this->sets = array_merge($this->sets, $this->groupLoadedSets);
-
         $uniqueSets = array_unique($this->sets);
 
         if ($this->isWithPhpLevelUsed && $this->isWithPhpSetsUsed) {
@@ -732,12 +710,7 @@ public function withComposerBased(
 
                 // single set, as every rule inside is bound to the installed package version on its own
                 $this->sets[] = $setFilePath;
-                continue;
             }
-
-            // @deprecated fallback for extensions that still describe their sets as objects,
-            // instead of bonding the rules themselves
-            $this->setGroups[] = $setGroup;
         }
 
         if ($phpunit) {

src/Set/SetManager.php

@@ -28,10 +28,10 @@ public function testEverySetGroupToggleHasASetListMapped(): void
     }
 
     /**
-     * The extension packages are not required by rector-src, so their constant is undefined here and the
-     * deprecated set group has to keep working.
+     * The extension packages are not required by rector-src, so their constant is undefined here and
+     * nothing is loaded for the toggle.
      */
-    public function testFallsBackToTheSetGroupWhenTheExtensionIsNotInstalled(): void
+    public function testLoadsNothingWhenTheExtensionIsNotInstalled(): void
     {
         foreach ($this->provideExtensionComposerBasedSetLists() as $setListConstant) {
             $this->assertFalse(defined($setListConstant), $setListConstant);
@@ -40,7 +40,6 @@ public function testFallsBackToTheSetGroupWhenTheExtensionIsNotInstalled(): void
         $rectorConfigBuilder = new RectorConfigBuilder()
             ->withComposerBased(laravel: true, drupal: true);
 
-        $this->assertSame([SetGroup::LARAVEL, SetGroup::DRUPAL], $this->readPrivateArray($rectorConfigBuilder, 'setGroups'));
         $this->assertSame([], $this->readPrivateArray($rectorConfigBuilder, 'sets'));
     }