Remove unused user_sessions

app/views/ci/user_sessions/show.html.haml

-= image_tag user_avatar_url(current_user, 90), class: 'avatar avatar-inline avatar-tile s90', alt: ''
-%h3
-  Hi, #{@user.name}
-
-  - if @user.is_admin?
-    %span.label.label-success Admin
-
-.profile-block
-  %p
-    %span.light Email:
-    %strong= @user.email
-
-  %p
-    %span.light GitLab profile:
-    %strong= link_to @user.username, GitlabCi.config.gitlab_server.url + '/u/' + @user.username, target: "_blank"