Merge branch '29577-restore-sub-nav-with-activity-tab' into 'master'

Restore sub-nav (Activity) for empty project

Closes #29577

See merge request !10033

app/views/projects/empty.html.haml

@@ -5,6 +5,7 @@
     = render 'shared/no_ssh'
     = render 'shared/no_password'
 
+= render "projects/head"
 = render "home_panel"
 
 .row-content-block.second-block.center