Remove --incompatible_proto_output_v2.

This flag has been no-op for a long while. Also skipping the graveyard and just removing the flag here.

PiperOrigin-RevId: 447763060

src/main/java/com/google/devtools/build/lib/query2/aquery/AqueryOptions.java

diff --git a/src/main/java/com/google/devtools/build/lib/query2/aquery/AqueryOptions.java b/src/main/java/com/google/devtools/build/lib/query2/aquery/AqueryOptions.java
index 3e003f3..58a841a 100644
--- a/src/main/java/com/google/devtools/build/lib/query2/aquery/AqueryOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/query2/aquery/AqueryOptions.java
@@ -17,7 +17,6 @@
 import com.google.devtools.common.options.Option;
 import com.google.devtools.common.options.OptionDocumentationCategory;
 import com.google.devtools.common.options.OptionEffectTag;
-import com.google.devtools.common.options.OptionMetadataTag;
 
 /** Options class for aquery specific query options. */
 public class AqueryOptions extends CommonQueryOptions {
@@ -71,18 +70,6 @@
   public boolean queryCurrentSkyframeState;
 
   @Option(
-      name = "incompatible_proto_output_v2",
-      defaultValue = "true",
-      documentationCategory = OptionDocumentationCategory.QUERY,
-      effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
-      metadataTags = {
-        OptionMetadataTag.INCOMPATIBLE_CHANGE,
-        OptionMetadataTag.DEPRECATED,
-      },
-      help = "No-op.")
-  public boolean protoV2;
-
-  @Option(
       name = "deduplicate_depsets",
       defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.QUERY,