Revert "file_finder: Remove common segments of long paths in search results (#25049)" (#25163)

This reverts commit 9ef0501853 due to a
panic.

```
{
  "thread": "main",
  "payload": "9 is not a valid char boundary in path \"crates/…/LiveKitBridge/\"",
  "location_data": {
    "file": "crates/file_finder/src/file_finder.rs",
    "line": 646
  }
}
```

Release Notes:

- N/A

crates/buffer_diff/src/buffer_diff.rs

@@ -719,6 +719,7 @@ impl BufferDiff {
         Some(start..end)
     }
 
+    #[allow(clippy::too_many_arguments)]
     pub async fn update_diff(
         this: Entity<BufferDiff>,
         buffer: text::BufferSnapshot,