chore: cleanup inefficient_to_string lint

Apparently this causes a slowdown per [docs](https://rust-lang.github.io/rust-clippy/master/index.html#inefficient_to_string).

I used this command and fixed a few remaining manual ones.

```sh
__CARGO_FIX_YOLO=1 cargo clippy --fix --all-targets --workspace --allow-dirty
```

Cargo.toml

@@ -645,7 +645,6 @@ redundant_else = "allow"                     # 58
 map_unwrap_or = "allow"                      # 54
 cast_precision_loss = "allow"                # 52
 unnested_or_patterns = "allow"               # 40
-inefficient_to_string = "allow"              # 38
 unnecessary_wraps = "allow"                  # 37
 cast_lossless = "allow"                      # 33
 ignored_unit_patterns = "allow"              # 29