Construct Records only through checked helpers (#11386)

# Description

Constructing the internals of `Record` without checking the lengths is
bad. (also incompatible with changes to how we store records)

- Use `Record::from_raw_cols_vals` in dataframe code
- Use `record!` macro in dataframe test
- Use `record!` in `nu-color-config` tests
- Stop direct record construction in `nu-command`
- Refactor table construction in `from nuon`

# User-Facing Changes
None

# Tests + Formatting
No new tests, updated tests in equal fashion

crates/nu-command/src/formats/from/delimited.rs

@@ -55,10 +55,7 @@ fn from_delimited_string_to_value(
             .collect::<Vec<Value>>();
 
         rows.push(Value::record(
-            Record {
-                cols: headers.clone(),
-                vals: output_row,
-            },
+            Record::from_raw_cols_vals(headers.clone(), output_row),
             span,
         ));
     }

crates/nu-command/src/formats/from/nuon.rs

@@ -403,13 +403,7 @@ fn convert_to_value(
             }
 
             for row in cells {
-                let mut vals = vec![];
-
-                for cell in row {
-                    vals.push(convert_to_value(cell, span, original_text)?);
-                }
-
-                if cols.len() != vals.len() {
+                if cols.len() != row.len() {
                     return Err(ShellError::OutsideSpannedLabeledError {
                         src: original_text.to_string(),
                         error: "Error when loading".into(),
@@ -417,12 +411,13 @@ fn convert_to_value(
                         span: expr.span,
                     });
                 }
+                let vals: Vec<Value> = row
+                    .into_iter()
+                    .map(|cell| convert_to_value(cell, span, original_text))
+                    .collect::<Result<_, _>>()?;
 
                 output.push(Value::record(
-                    Record {
-                        cols: cols.clone(),
-                        vals,
-                    },
+                    Record::from_raw_cols_vals(cols.clone(), vals),
                     span,
                 ));
             }