better error message for "sum", "product", and "sum_of_squares" (#14711)

# Description

This PR tries to improve a few error messages.

### Before

![image](https://github.com/user-attachments/assets/58ab3ff6-baab-4075-8746-e83cb3acab14)

### After

![image](https://github.com/user-attachments/assets/9653776a-371b-4454-b092-3cc49f1329cd)

 
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crates/nu-command/tests/commands/math/sum.rs

@@ -73,9 +73,7 @@ fn sum_of_a_row_containing_a_table_is_an_error() {
         cwd: "tests/fixtures/formats/",
         "open sample-sys-output.json | math sum"
     );
-    assert!(actual
-        .err
-        .contains("Attempted to compute the sum of a value that cannot be summed"));
+    assert!(actual.err.contains("can't convert record"));
 }
 
 #[test]