### 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
for (var unit : List.of("day", "week", "month", "year")) {
            assertEquals(
                "1:5: [-] arguments are in unsupported order: cannot subtract a [DATETIME] value [now()] from a [DATE_PERIOD] amount [1 "
                    + unit
                    + "]",
                error("row 1 " + unit + " - now() ")
            );
        }
    }
    public void testPeriodAndDurationInEval() {
        for (var unit : List.of("millisecond", "second", "minute", "hour")) {
            assertEquals(
                "1:18: EVAL does not support type [time_duration] in expression [1 " + unit + "]",
                error("row x = 1 | eval y = 1 " + unit)
            );
        }
        for (var unit : List.of("day", "week", "month", "year")) {
            assertEquals(
                "1:18: EVAL does not support type [date_period] in expression [1 " + unit + "]",
                error("row x = 1 | eval y = 1 " + unit)
            );
        }
    }
    public void testFilterNonBoolField() {
        assertEquals("1:19: Condition expression needs to be boolean, found [INTEGER]", error("from test | where emp_no"));
    }
    public void testFilterDateConstant() {
        assertEquals("1:19: Condition expression needs to be boolean, found [DATE_PERIOD]", error("from test | where 1 year"));
    }
    private String error(String query) {