feat: Add a view for unattended conversations (#5890)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

spec/finders/conversation_finder_spec.rb

@@ -136,5 +136,15 @@ describe ::ConversationFinder do
         expect(result[:conversations].length).to be 25
       end
     end
+
+    context 'with unattended' do
+      let(:params) { { status: 'open', assignee_type: 'me', conversation_type: 'unattended' } }
+
+      it 'returns unattended conversations' do
+        create_list(:conversation, 25, account: account, inbox: inbox, assignee: user_1)
+        result = conversation_finder.perform
+        expect(result[:conversations].length).to be 25
+      end
+    end
   end
 end