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/utils/utils.jsx

@@ -1117,17 +1117,6 @@ export function windowHeight() {
     return $(window).height();
 }
 
-// Use when sorting multiple teams by their `display_name` field
-export function sortTeamsByDisplayName(a, b) {
-    const locale = LocalizationStore.getLocale();
-
-    if (a.display_name !== b.display_name) {
-        return a.display_name.localeCompare(b.display_name, locale, {numeric: true});
-    }
-
-    return a.name.localeCompare(b.name, locale, {numeric: true});
-}
-
 export function getChannelTerm(channelType) {
     let channelTerm = 'Channel';
     if (channelType === Constants.PRIVATE_CHANNEL) {