Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/gpui/src/platform/mac/platform.rs

@@ -797,7 +797,7 @@ impl Platform for MacPlatform {
                                         .to_owned();
                                         result.set_file_name(&new_filename);
                                     }
-                                    return result;
+                                    result
                                 })
                             }
                         }