fix(bigtable): do not update DA feature flags

Author: mutianf

java-bigtable/google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/compat/GaxBasicChannelProvider.java

@@ -48,10 +48,7 @@ public GaxBasicChannelProvider(
 
   @Override
   public FeatureFlags updateFeatureFlags(FeatureFlags featureFlags) {
-    return featureFlags.toBuilder()
-        .setTrafficDirectorEnabled(false)
-        .setDirectAccessRequested(false)
-        .build();
+    return featureFlags;
   }
 
   @Override