Search: duplicate results after renaming file to different case

[bpasero]

Steps to Reproduce:

1. on macOS open file.txt and search for a word inside to populate search view
2. from the file explorer rename the file to FILE.txt
3. trigger search again

=> 🐛 you see 2 results

My feeling is that search somewhere needs to adopt the IURIIdentityService to properly de-dupe results that are same.

[andreamah]

Maybe related to #140970?