Add symlink label to blob viewer

Problem to solve

Similarly to #215395 (closed), we should highlight symlinks in the blob viewer too. Currently, other than the icon, there's no explanation that this is a symlink file (example: https://gitlab.com/redbaron1/diffbug/-/blob/master/deployconfig.js)

Further details

Proposal

Add a Symbolic link · label next to the file name, before the file size.

Documentation

Availability & Testing

What does success look like, and how can we measure that?

What is the type of buyer?

Is this a cross-stage feature?

Links / references