[apache#5831] fix(CLI): Fix Dropping a metalake via the Gravitino CLI…

… gives an "in use" exception.

Dropping a metalake via the Gravitino CLI gives an "in use" exception.if a metalake in use, it should give some hints.

clients/cli/src/main/java/org/apache/gravitino/cli/commands/DeleteMetalake.java

@@ -22,6 +22,7 @@
 import org.apache.gravitino.cli.AreYouSure;
 import org.apache.gravitino.cli.ErrorMessages;
 import org.apache.gravitino.client.GravitinoAdminClient;
+import org.apache.gravitino.exceptions.MetalakeInUseException;
 import org.apache.gravitino.exceptions.NoSuchMetalakeException;
 
 public class DeleteMetalake extends Command {
@@ -57,6 +58,8 @@ public void handle() {
     } catch (NoSuchMetalakeException err) {
       System.err.println(ErrorMessages.UNKNOWN_METALAKE);
       return;
+    } catch (MetalakeInUseException inUseException) {
+      System.err.println(metalake + " in use, plz disable it.");
     } catch (Exception exp) {
       System.err.println(exp.getMessage());
       return;