fix: getFileDiagnostics waits forever

Makes sure that 'getFileDiagnostics' internal promises are resolved.

In some code paths the 'getFileDiagnostics' tool function constructed
a promise to wait between 500ms-5000ms for diagnostics. However this
promise did never resolve, leading to an endless wait.

fixes #15299

Author: sdirix

packages/ai-ide/src/browser/workspace-functions.ts

@@ -392,9 +392,9 @@ export class FileDiagonsticProvider implements ToolProvider {
                 await open(this.openerService, uri);
                 // Give some time to fetch problems in a newly opened editor.
                 await new Promise<void>(res => {
-                    setTimeout(() => res, 5000);
+                    setTimeout(() => res(), 5000);
                     // Give another moment for additional markers to come in from different sources.
-                    const listener = this.problemManager.onDidChangeMarkers(changed => changed.isEqual(uri) && setTimeout(res, 500));
+                    const listener = this.problemManager.onDidChangeMarkers(changed => changed.isEqual(uri) && setTimeout(() => res(), 500));
                     toDispose.push(listener);
                 });
                 markers = this.problemManager.findMarkers({ uri });