fix: make sure old fix panels are closed on startup

src/snyk/snykCode/views/webviewPanelSerializer.ts

@@ -0,0 +1,12 @@
+import * as vscode from 'vscode';
+import { WebviewProvider } from '../../../snyk/common/views/webviewProvider';
+
+export class WebviewPanelSerializer<_ extends WebviewProvider<State>, State>
+  implements vscode.WebviewPanelSerializer
+{
+  constructor() {}
+  async deserializeWebviewPanel(webviewPanel: vscode.WebviewPanel): Promise<void> {
+      // we want to make sure the panel is closed on startup
+      webviewPanel.dispose();
+  }
+}