Added group contribution analytics to new sidebar

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/35824

app/views/layouts/nav/_new_group_sidebar.html.haml

@@ -9,7 +9,7 @@
       %span.sr-only Close sidebar
       = icon ('times')
   %ul.sidebar-top-level-items
-    = nav_link(path: ['groups#show', 'groups#activity', 'groups#subgroups'], html_options: { class: 'home' }) do
+    = nav_link(path: ['groups#show', 'groups#activity', 'groups#subgroups', 'analytics#show'], html_options: { class: 'home' }) do
       = link_to group_path(@group), title: 'About group' do
         %span
           About
@@ -25,6 +25,12 @@
             %span
               Activity
 
+        - if @group.feature_available?(:contribution_analytics)
+          = nav_link(path: 'analytics#show') do
+            = link_to group_analytics_path(@group), title: 'Contribution Analytics', data: {placement: 'right'} do
+              %span
+                Contribution Analytics
+
     = nav_link(path: ['groups#issues', 'labels#index', 'milestones#index']) do
       = link_to issues_group_path(@group), title: 'Issues' do
         %span