Add default implementation to new finalizeSnapshot() in Repository (opensearch-project#16128)

Signed-off-by: Sachin Kale <sachinpkale@gmail.com>

Author: sachinpkale

server/src/main/java/org/opensearch/repositories/Repository.java

@@ -180,7 +180,7 @@ void finalizeSnapshot(
      * @param repositoryUpdatePriority  priority for the cluster state update task
      * @param listener              listener to be invoked with the new {@link RepositoryData} after completing the snapshot
      */
-    void finalizeSnapshot(
+    default void finalizeSnapshot(
         ShardGenerations shardGenerations,
         long repositoryStateId,
         Metadata clusterMetadata,
@@ -189,7 +189,9 @@ void finalizeSnapshot(
         Function<ClusterState, ClusterState> stateTransformer,
         Priority repositoryUpdatePriority,
         ActionListener<RepositoryData> listener
-    );
+    ) {
+        throw new UnsupportedOperationException();
+    }
 
     /**
      * Deletes snapshots