Merge branch 'enable-scss-lint-single-line-per-selector' into 'master'

Enable SingleLinePerSelector in scss-lint

## What does this MR do?
Enables `SingleLinePerSelector` in `.scss-lint.yml`

## Are there points in the code the reviewer needs to double check?
This MR touches a lot of files, just need another pair of eyes to look through and make sure I didn't break anything.

## Why was this MR needed?
Improve SCSS maintainability and consistency

## Screenshots (if relevant)
None

## Does this MR meet the acceptance criteria?

- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [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 it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
#23485

See merge request !7081

1 files changed, 4 insertions, 2 deletions

diff --git a/app/assets/stylesheets/pages/tree.scss b/app/assets/stylesheets/pages/tree.scss
index 84dcd6835d5..2b836fa1f4a 100644
--- a/app/assets/stylesheets/pages/tree.scss
+++ b/app/assets/stylesheets/pages/tree.scss
@@ -23,7 +23,8 @@
       border-bottom: 1px solid $table-border-gray;
       border-top: 1px solid $table-border-gray;
 
-      td, th {
+      td,
+      th {
         line-height: 21px;
       }
 
@@ -74,7 +75,8 @@
       max-width: 320px;
       vertical-align: middle;
 
-      i, a {
+      i,
+      a {
         color: $gl-dark-link-color;
       }