feat: remove cookie on sign out

Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/app-backend/api-report.md

@@ -3,9 +3,11 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
+import { AuthService } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import { ConfigSchema } from '@backstage/config-loader';
 import express from 'express';
+import { HttpAuthService } from '@backstage/backend-plugin-api';
 import { Logger } from 'winston';
 import { PluginDatabaseManager } from '@backstage/backend-common';
 
@@ -16,10 +18,14 @@ export function createRouter(options: RouterOptions): Promise<express.Router>;
 export interface RouterOptions {
   appPackageName: string;
   // (undocumented)
+  auth?: AuthService;
+  // (undocumented)
   config: Config;
   database?: PluginDatabaseManager;
   disableConfigInjection?: boolean;
   // (undocumented)
+  httpAuth?: HttpAuthService;
+  // (undocumented)
   logger: Logger;
   schema?: ConfigSchema;
   staticFallbackHandler?: express.Handler;