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/collab/src/tests/randomized_test_helpers.rs

@@ -463,6 +463,7 @@ impl<T: RandomizedTest> TestPlan<T> {
         })
     }
 
+    #[allow(clippy::too_many_arguments)]
     async fn apply_server_operation(
         plan: Arc<Mutex<Self>>,
         deterministic: BackgroundExecutor,