Deprecate the Group Chats for Events Feature (PalisadoesFoundation#2305)

* Events Feature removed

* test fixes

* docs rewrite

* comment fixes

* comment fixes

* fixes

lib/views/after_auth_screens/chat/chat_list_screen.dart

@@ -1,20 +1,17 @@
-// ignore_for_file: talawa_api_doc
-// ignore_for_file: talawa_good_doc_comments
-
 import 'package:flutter/material.dart';
 import 'package:talawa/views/after_auth_screens/chat/direct_chats.dart';
-import 'package:talawa/views/after_auth_screens/chat/event_chats.dart';
 import 'package:talawa/views/after_auth_screens/chat/select_contact.dart';
 
-/// ChatPage returns a stateless widget for current user Chat Page which renders
-/// the list of all the users that the current user has chat with.
+/// ChatPage returns a stateless widget.
+///
+/// That renders a list of users with whom the current user has chatted.
 class ChatPage extends StatelessWidget {
   const ChatPage({super.key});
 
   @override
   Widget build(BuildContext context) {
     return DefaultTabController(
-      length: 2,
+      length: 1,
       child: Scaffold(
         appBar: AppBar(
           backgroundColor: Theme.of(context).primaryColor,
@@ -32,17 +29,13 @@ class ChatPage extends StatelessWidget {
               Tab(
                 text: "Direct",
               ),
-              Tab(
-                text: "Events",
-              ),
             ],
           ),
         ),
         // returns a tabs on the top for current user to switch between DirectChats and EventChats.
         body: const TabBarView(
           children: [
             DirectChats(),
-            EventChats(),
           ],
         ),
         floatingActionButton: FloatingActionButton(