Merge branch 'merge-request-lfs-badge' into 'master'

Added LFS badge to merge request files tracked by LFS

Closes #41829

See merge request gitlab-org/gitlab-ce!16345

app/views/projects/diffs/_file_header.html.haml

@@ -35,3 +35,6 @@
   - if diff_file.mode_changed?
     %small
       #{diff_file.a_mode} → #{diff_file.b_mode}
+
+  - if diff_file.stored_externally? && diff_file.external_storage == :lfs
+    %span.label.label-lfs.append-right-5 LFS