Use variable names directly in the format strings (#7906)

# Description

Lint: `clippy::uninlined_format_args`

More readable in most situations.
(May be slightly confusing for modifier format strings
https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters)

Alternative to #7865

# User-Facing Changes

None intended

# Tests + Formatting

(Ran `cargo +stable clippy --fix --workspace -- -A clippy::all -D
clippy::uninlined_format_args` to achieve this. Depends on Rust `1.67`)

crates/nu-command/src/strings/format/command.rs

@@ -303,7 +303,7 @@ fn format_record(
                     }
                     Some(err) => {
                         return Err(ShellError::TypeMismatch(
-                            format!("expression is invalid, detail message: {:?}", err),
+                            format!("expression is invalid, detail message: {err:?}"),
                             *span,
                         ))
                     }