PLT-6214 Move channel store and actions over to redux (#6235)

* Move channel store and actions over to redux

* Fix style errors

* Fix unit test

* Various fixes

* More fixes

* Revert config changes

webapp/components/sidebar.jsx

@@ -5,7 +5,7 @@ import $ from 'jquery';
 import ReactDOM from 'react-dom';
 import NewChannelFlow from './new_channel_flow.jsx';
 import MoreDirectChannels from 'components/more_direct_channels';
-import MoreChannels from 'components/more_channels.jsx';
+import MoreChannels from 'components/more_channels';
 import SidebarHeader from './sidebar_header.jsx';
 import UnreadChannelIndicator from './unread_channel_indicator.jsx';
 import TutorialTip from './tutorial/tutorial_tip.jsx';