Auto merge of rust-lang#16252 - Urhengulas:dont-assert-debug, r=Veykril

internal: Switch to `expected.assert_eq` for `ide` tests

This PR switches from `assert_debug_eq` to `assert_eq` and only compares parts of the result and not the whole. The aim is to only compare parts which are relevant to the test and also make it more readable.

Part of rust-lang#14268.

## Questions
- [x] Can I use `Vec`? If not, what is the alternative?
    I assume I cannot because of: https://github.com/rust-lang/rust-analyzer/blob/c3a00b5468576de4e39adc8fa5ceae35a0024e49/docs/dev/architecture.md?plain=1#L413
- [x] Should I group it by file, as proposed by Lukas?
    ```
    file_id 1:
        source_file_edits:
            - Indel { insert: "foo2", delete: 4..7 }

    file_id 2:
        file_system_edits:
            MoveFile AnchoredPathBuf { anchor: FileId(2), path: "foo2.rs", }
    ```
- [x] Is it okay to ignore `CreateFile` events? They do not have a FileId, which would be problematic, but they do not occur in the existing tests, so I marked them as `unreachable!()` so far.

Author: bors