Inline all format arguments where possible

This makes code more readale and concise,
moving all format arguments like `format!("{}", foo)`
into the more compact `format!("{foo}")` form.

The change was automatically created with, so there are far less change
of an accidental typo.

```
cargo clippy --fix -- -A clippy::all -W clippy::uninlined_format_args
```

crates/ide-db/src/syntax_helpers/format_string_exprs.rs

@@ -205,7 +205,7 @@ mod tests {
     fn check(input: &str, expect: &Expect) {
         let (output, exprs) = parse_format_exprs(input).unwrap_or(("-".to_string(), vec![]));
         let outcome_repr = if !exprs.is_empty() {
-            format!("{}; {}", output, with_placeholders(exprs).join(", "))
+            format!("{output}; {}", with_placeholders(exprs).join(", "))
         } else {
             output
         };