Make SkylarkCallableProcessor#process return false

Returning true consumes the annotation and hides it from other post processors. Returning false allows other processors to also act upon the annotations.

PiperOrigin-RevId: 280509697
diff --git a/src/main/java/com/google/devtools/build/lib/skylarkinterface/processor/SkylarkCallableProcessor.java b/src/main/java/com/google/devtools/build/lib/skylarkinterface/processor/SkylarkCallableProcessor.java
index 8ff22e2..d7930e3 100644
--- a/src/main/java/com/google/devtools/build/lib/skylarkinterface/processor/SkylarkCallableProcessor.java
+++ b/src/main/java/com/google/devtools/build/lib/skylarkinterface/processor/SkylarkCallableProcessor.java
@@ -189,7 +189,8 @@
       }
     }
 
-    return true;
+    // Returning false allows downstream processors to work on the same annotations
+    return false;
   }
 
   private void verifyNoNameConflict(ExecutableElement methodElement, SkylarkCallable annotation)