### 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
var operation = left + " " + comp + " " + right;
                assertThat(
                    error("row n = to_" + type + "(1), ul = to_ul(1) | where " + operation),
                    containsString(
                        "first argument of ["
                            + operation
                            + "] is ["
                            + leftType
                            + "] and second is ["
                            + rightType
                            + "]."
                            + " [unsigned_long] can only be operated on together with another [unsigned_long]"
                    )
                );
            }
        }
    }
    public void testUnsignedLongTypeMixInArithmetics() {
        List<String> types = EsqlDataTypes.types()
            .stream()
            .filter(dt -> dt.isNumeric() && EsqlDataTypes.isRepresentable(dt) && dt != UNSIGNED_LONG)
            .map(DataType::typeName)
            .toList();
        for (var type : types) {
            for (var operation : List.of("+", "-", "*", "/", "%")) {
                String left, right, leftType, rightType;
                if (randomBoolean()) {
                    left = "ul";
                    leftType = "unsigned_long";
                    right = "n";