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-completion/src/completions.rs

@@ -133,7 +133,7 @@ impl Completions {
                 if incomplete_let && snippet.ends_with('}') {
                     // complete block expression snippets with a trailing semicolon, if inside an incomplete let
                     cov_mark::hit!(let_semi);
-                    item.insert_snippet(cap, format!("{};", snippet));
+                    item.insert_snippet(cap, format!("{snippet};"));
                 } else {
                     item.insert_snippet(cap, snippet);
                 }