Suggestions that come from rustc that are multi-line only use LF line
endings. But if the file is checked out on windows with CRLF
line-endings, then you end up with a mix of line endings that don't
match the "fixed.rs" file.
Tracking this at https://github.com/rust-lang/rust/issues/119482.
review and remove ignored tests in rustfix
### What does this PR try to resolve?
review ignored tests in rustfix crate per #13034.
### How should we test and review this PR?
CI testing
### Additional information
* Removed unproductive test in `parse_and_replace`
* un-ignore proptests, and reduce runtime from ~2s to ~<.25s