Merge branch 'enable-scss-lint-trailing-whitespace' into 'master'

Enable trailingWhitespace in scss-lint

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

## Are there points in the code the reviewer needs to double check?
None

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

## Screenshots (if relevant)
None

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- Tests
  - [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 !7077

.scss-lint.yml

@@ -223,7 +223,7 @@ linters:
 
   # Reports lines containing trailing whitespace.
   TrailingWhitespace:
-    enabled: false
+    enabled: true
 
   # Don't write trailing zeros for numeric values with a decimal point.
   TrailingZero: