Merge branch 'fix-relative-root-emoji-support' into 'master'

Fix emoji paths in relative root configurations

## What does this MR do?

If a site specifies a relative URL root, emoji files would omit the path from the URL, leading to lots of 404s.

## Are there points in the code the reviewer needs to double check?

At first, I tried to use `ActionView::Helpers::AssetUrlHelper.asset_url` since this is what it's intended to do. But this helper function is extremely slow, and it took minutes to generate the URLs for the hundreds of links needed for each emoji.

## Why was this MR needed?

Because emojis were broken in relative URL installations

## What are the relevant issue numbers?

#15642

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [X] Added for this feature/bug
  - [x] All builds are passing
- [X] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [X] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [X] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5027
(cherry picked from commit 88dbc4d110507c4c658d45e2b0ec0a2db756d6b9)

1 files changed, 1 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index c54a003bf56..3a0804b2bc2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.9.5
+  - Fix emoji paths in relative root configurations. !5027
   - Fix issues importing events in Import/Export. !4987
   - Fixed 'use shortcuts' button on docs. !4979
   - Admin should be able to turn shared runners into specific ones. !4961