Show indicator for files that are tracked by Git LFS

It's helpful to know if a file is tracked with git-lfs but there is no way to tell through the GitLab interface.

We should add an indicators so that people know when viewing files, in the repo view, merge requests and anywhere else.

Proposal

Add LFS indicator to files tracked by Git LFS

• File list (project/repository view)
• Blob viewer/editor (including merge requests)
• Multi-file editor

Design

Reuse existing tags UI and make it look like:

Robin's proposal