[apache#5831] fix(CLI): Fix CLi gives unexpected output when setting …

…a tag

Running the command gcli tag set --metalake metalake_demo or gcli tag remove --metalake metalake_demo gives unexpected output.it should give some help information.

clients/cli/src/main/java/org/apache/gravitino/cli/ErrorMessages.java

@@ -30,6 +30,8 @@ public class ErrorMessages {
   public static final String UNKNOWN_TABLE = "Unknown table name.";
   public static final String MALFORMED_NAME = "Malformed entity name.";
   public static final String MISSING_NAME = "Missing --name option.";
+  public static final String MISSING_ENTITY =
+      "Unable to determine the entity. Please specify one" + " using the --name option.";
   public static final String METALAKE_EXISTS = "Metalake already exists.";
   public static final String CATALOG_EXISTS = "Catalog already exists.";
   public static final String SCHEMA_EXISTS = "Schema already exists.";