### Description

`stats x = count`  throws error `unknown column [count]` which is confusing since stats does not allow aliasing for existing columns but only points to aggregate functions.
Hence why the message should be `incorrect function declaration count, you forgot to add the parantheisis`. 
Same approach when dealing with a typo: `stats x = cont(*)` - `Unkown aggregate function cont - did you mean count()?`

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */
package org.elasticsearch.xpack.esql.analysis;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.xpack.esql.parser.EsqlParser;
import org.elasticsearch.xpack.esql.parser.TypedParamValue;
import org.elasticsearch.xpack.esql.type.EsqlDataTypes;
import org.elasticsearch.xpack.ql.type.DataType;
import java.util.ArrayList;
import java.util.List;
import static org.elasticsearch.xpack.ql.type.DataTypes.UNSIGNED_LONG;
import static org.hamcrest.Matchers.containsString;
public class VerifierTests extends ESTestCase {