Suggest correct path in include_bytes!

`include_bytes!` paths are relative, and I'm often not sure how nested is the `.rs` file that I'm editing, so I have to guess the number of `"../.."`. This change searches `..` and `../..` for the given file and offers corrected path as a suggestion.

I wasn't sure how to get the right span, and how to properly escape it.

```text
error: couldn't read src/file.txt: No such file or directory (os error 2)
 --> src/main.rs:2:13
  |
2 |     let x = include_bytes!("file.txt");
  |             ^^^^^^^^^^^^^^^----------^
  |                            |
  |                            help: it's in a parent directory: `"../../file.txt"`
```

…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#113518 (bootstrap/libtest: print test name eagerly on failure even with `verbose-tests=false` / `--quiet`)
 - rust-lang#117199 (Change the documented implicit value of `-C instrument-coverage` to `=yes`)
 - rust-lang#121190 (avoid overlapping privacy suggestion for single nested imports)
 - rust-lang#121382 (Rework `untranslatable_diagnostic` lint)
 - rust-lang#121833 (Suggest correct path in include_bytes!)
 - rust-lang#121959 (Removing absolute path in proc-macro)
 - rust-lang#122038 (Fix linting paths with qself in `unused_qualifications`)
 - rust-lang#122051 (cleanup: remove zero-offset GEP)

r? `@ghost`
`@rustbot` modify labels: rollup

Suggest correct path in include_bytes!

`include_bytes!` paths are relative, and I'm often not sure how nested is the `.rs` file that I'm editing, so I have to guess the number of `"../.."`. This change searches `..` and `../..` for the given file and offers corrected path as a suggestion.

I wasn't sure how to get the right span, and how to properly escape it.

```text
error: couldn't read src/file.txt: No such file or directory (os error 2)
 --> src/main.rs:2:13
  |
2 |     let x = include_bytes!("file.txt");
  |             ^^^^^^^^^^^^^^^----------^
  |                            |
  |                            help: it's in a parent directory: `"../../file.txt"`
```