refactor: exchange default with actual variant to cause compile errors upon implementation changes

Author: AlexanderSchultheiss

src/main/java/org/variantsync/diffdetective/variation/NodeType.java

@@ -73,7 +73,7 @@ public static NodeType fromAnnotationType(final AnnotationType annotationType) {
             case Elif -> NodeType.ELIF;
             case Else -> NodeType.ELSE;
             case None -> NodeType.ARTIFACT;
-            default -> throw new IllegalArgumentException(annotationType + "has no NodeType counterpart");
+            case Endif -> throw new IllegalArgumentException(annotationType + "has no NodeType counterpart");
         };
     }