Enhance path handling in ChangeProcessor and snapshot_project

- Canonicalized the project_root in ChangeProcessor to ensure consistent path comparisons on Windows, addressing issues with the \\?\ prefix.
- Updated snapshot_project to push canonicalized paths to relevant_paths, improving path accuracy in project snapshots.

These changes enhance the reliability of path handling in the project and improve overall consistency in file operations.

src/snapshot_middleware/project.rs

@@ -147,7 +147,10 @@ pub fn snapshot_project(
             // We SHOULD NOT mark the project file as a relevant path for any
             // nodes that aren't roots. They'll be updated as part of the project
             // file being updated.
-            snapshot.metadata.relevant_paths.push(path.to_path_buf());
+            snapshot
+                .metadata
+                .relevant_paths
+                .push(vfs.canonicalize(path)?);
 
             Ok(Some(snapshot))
         }