🚚(collaboration) change the websocket url name

We will have 2 urls targeting the server, better
to improve the naming to avoid confusion.

src/frontend/apps/e2e/__tests__/app-impress/config.spec.ts

@@ -6,7 +6,7 @@ import { createDoc } from './common';
 
 const config = {
   CRISP_WEBSITE_ID: null,
-  COLLABORATION_SERVER_URL: 'ws://localhost:4444',
+  COLLABORATION_WS_URL: 'ws://localhost:4444',
   ENVIRONMENT: 'development',
   FRONTEND_THEME: 'dsfr',
   MEDIA_BASE_URL: 'http://localhost:8083',