Fix file watcher exhaustion by disabling symlink following (#4625)

* Initial plan

* Fix file watcher exhaustion by adding followSymlinks: false option

When followSymlinks is true (the default), chokidar follows symlinks and
watches their targets. If a symlink points to a directory like the user's
home directory, chokidar would recursively watch that entire directory
structure, causing an explosion in file watchers (250k+).

This change aligns with other file watchers in the codebase (kitsController.ts,
variant.ts, extension.ts) which all use followSymlinks: false.

Co-authored-by: gcampbell-msft <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: gcampbell-msft <[email protected]>
Co-authored-by: Hannia Valera <[email protected]>

Author: 3 people

src/presets/presetsController.ts

@@ -1612,7 +1612,7 @@ export class PresetsController implements vscode.Disposable {
         ]);
 
         this._presetsWatchers?.dispose();
-        this._presetsWatchers = new FileWatcher(this._referencedFiles, events, { ignoreInitial: true });
+        this._presetsWatchers = new FileWatcher(this._referencedFiles, events, { ignoreInitial: true, followSymlinks: false });
     };
 
     dispose() {