Add missing fa- icons for file_type_icon_class
This is a regression related to Fontawesome
icon replacements which got introduced in !37922 (diffs). Some file icons that come from the file_type_icon_class helper are missing, e.g. see on https://gitlab.com/gitlab-org/gitlab/-/jobs/751254324/artifacts/browse/public/assets/
We need to re-add the following fa-
icon classes to our fontawesome_custom.scss
file-pdf-o
file-image-o
file-archive-o
file-audio-o
fa-file-video-o
file-word-o
file-excel-o
file-powerpoint-o
Edited by Martin Wortschack