Open visibility of ProtoOutputFormatter in order to use it in PackageLoader.

PiperOrigin-RevId: 250548195
diff --git a/src/main/java/com/google/devtools/build/lib/query2/query/output/ProtoOutputFormatter.java b/src/main/java/com/google/devtools/build/lib/query2/query/output/ProtoOutputFormatter.java
index cfd0119..1c536b9 100644
--- a/src/main/java/com/google/devtools/build/lib/query2/query/output/ProtoOutputFormatter.java
+++ b/src/main/java/com/google/devtools/build/lib/query2/query/output/ProtoOutputFormatter.java
@@ -176,7 +176,6 @@
   }
 
   /** Converts a logical {@link Target} object into a {@link Build.Target} protobuffer. */
-  @VisibleForTesting
   public Build.Target toTargetProtoBuffer(Target target) throws InterruptedException {
     return toTargetProtoBuffer(target, null);
   }