Fix @VisibleForTesting given the newly deployed enforcement

Generated code is now also covered by @VisibleForTesting, including Dagger @Inject

This CL is a cleanup of auto-generated code by ghm@ from the Error Prone team

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=228748874

java/google/registry/model/eppcommon/PhoneNumber.java

@@ -16,7 +16,6 @@ package google.registry.model.eppcommon;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.annotations.VisibleForTesting;
 import google.registry.model.Buildable;
 import google.registry.model.ImmutableObject;
 import javax.xml.bind.annotation.XmlAttribute;
@@ -66,7 +65,6 @@ public class PhoneNumber extends ImmutableObject {
   }
 
   /** A builder for constructing {@link PhoneNumber}. */
-  @VisibleForTesting
   public static class Builder<T extends PhoneNumber> extends Buildable.Builder<T> {
     @Override
     public T build() {