PLT-2713/PLT-6028 Added System Users list to System Console (#5882)

* PLT-2713 Added ability for admins to list users not in any team

* Updated style of unit test

* Split SearchableUserList to give better control over its properties

* Added users without any teams to the user store

* Added ManageUsers page

* Renamed ManageUsers to SystemUsers

* Added ability to search by user id in SystemUsers page

* Added SystemUsersDropdown

* Removed unnecessary injectIntl

* Created TeamUtils

* Reduced scope of system console heading CSS

* Added team filter to TeamAnalytics page

* Updated admin console sidebar

* Removed unnecessary TODO

* Removed unused reference to deleted modal

* Fixed system console sidebar not scrolling on first load

* Fixed TeamAnalytics page not rendering on first load

* Fixed chart.js throwing an error when switching between teams

* Changed TeamAnalytics header to show the team's display name

* Fixed appearance of TeamAnalytics and SystemUsers on small screen widths

* Fixed placement of 'No users found' message

* Fixed teams not appearing in SystemUsers on first load

* Updated user count text for SystemUsers

* Changed search by id fallback to trigger less often

* Fixed SystemUsers list items not updating when searching

* Fixed localization strings for SystemUsers page

webapp/components/needs_team.jsx

@@ -41,7 +41,6 @@ import RemovedFromChannelModal from 'components/removed_from_channel_modal.jsx';
 import ImportThemeModal from 'components/user_settings/import_theme_modal.jsx';
 import InviteMemberModal from 'components/invite_member_modal.jsx';
 import LeaveTeamModal from 'components/leave_team_modal.jsx';
-import SelectTeamModal from 'components/admin_console/select_team_modal.jsx';
 
 import iNoBounce from 'inobounce';
 import * as UserAgent from 'utils/user_agent.jsx';
@@ -212,7 +211,6 @@ export default class NeedsTeam extends React.Component {
                     <EditPostModal/>
                     <DeletePostModal/>
                     <RemovedFromChannelModal/>
-                    <SelectTeamModal/>
                 </div>
             </div>
         );