fix: remove getDoneableClass on JSON wrapper

Author: metacosm

operator-framework-quarkus-extension/tests/src/main/java/io/javaoperatorsdk/quarkus/it/TestOperatorApp.java

@@ -65,10 +65,6 @@ public String getAssociatedControllerClassName() {
       return conf.getAssociatedControllerClassName();
     }
 
-    public String getDoneableClass() {
-      return conf.getDoneableClass().getCanonicalName();
-    }
-
     public boolean isClusterScoped() {
       return conf.isClusterScoped();
     }