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/admin_console/database_settings.jsx

@@ -46,12 +46,10 @@ export default class DatabaseSettings extends AdminSettings {
 
     renderTitle() {
         return (
-            <h3>
-                <FormattedMessage
-                    id='admin.database.title'
-                    defaultMessage='Database Settings'
-                />
-            </h3>
+            <FormattedMessage
+                id='admin.database.title'
+                defaultMessage='Database Settings'
+            />
         );
     }