BUGFIX: Simplify projectionState to be more reliable

Previously if called with `ProjectionStateInterface::class` it would return the first state which will then not be callable again by its fqn. Now only fqn are allowed.
Initially the interface logic was needed for interchangeable cr readmodel projection states

Neos.ContentRepository.Core/Classes/ContentRepository.php

@@ -162,18 +162,17 @@ public function handle(CommandInterface $command): CommandResult
      */
     public function projectionState(string $projectionStateClassName): ProjectionStateInterface
     {
+        if (!isset($this->projectionStateCache)) {
+            foreach ($this->projectionsAndCatchUpHooks->additionalProjections as $projection) {
+                $projectionState = $projection->getState();
+                $this->projectionStateCache[$projectionState::class] = $projectionState;
+            }
+        }
         if (isset($this->projectionStateCache[$projectionStateClassName])) {
             /** @var T $projectionState */
             $projectionState = $this->projectionStateCache[$projectionStateClassName];
             return $projectionState;
         }
-        foreach ($this->projectionsAndCatchUpHooks->additionalProjections as $projection) {
-            $projectionState = $projection->getState();
-            if ($projectionState instanceof $projectionStateClassName) {
-                $this->projectionStateCache[$projectionStateClassName] = $projectionState;
-                return $projectionState;
-            }
-        }
         throw new \InvalidArgumentException(sprintf('A projection state of type "%s" is not registered in this content repository instance.', $projectionStateClassName), 1662033650);
     }