Fix filtering for workspace crates comparing canonical with non-canonical paths

[Tastaturtaste]

Checklist

• I have read the Contributor Guide
• I have read and agree to the Code of Conduct
• I have added a description of my changes and why I'd like them included in the section below

Description of Changes

When workspace filters (paths to workspace members' manifest) are added to the builder, the paths are automatically canonicalized. In the later checking against these filters the paths taken from the metadata are not canonical. This lead to no filter being able to match at all.

Related Issues

This fix is a prerequisite for my work on adding the --exclude-unpublished crates for cargo deny.
Please let me know if you also want me to open an issue in this repository to reference in this PR

[Tastaturtaste]

For me test test prefer_index::uses_sparse_index fails locally for this branch as well as for main. Not sure what is going on here, but since it already fails on main I don't think it has anything to do with my changes.

Edit:
Tested on linux via wsl. Works there. So test fail seem to be windows specific.