chore: remove unused, redundant method

Author: metacosm

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/internal/CustomResourceEvent.java

@@ -23,10 +23,6 @@ public Watcher.Action getAction() {
     return action;
   }
 
-  public String resourceUid() {
-    return getCustomResource().getMetadata().getUid();
-  }
-
   @Override
   public String toString() {
     return "CustomResourceEvent{"