Merge branch '24985-environments-spinner' into 'master'

Adds spinner class

## What does this MR do?
Adds class to  spinner icon to actually spin.

## Does this MR meet the acceptance criteria?
- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] 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)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #24985

See merge request !7761

app/assets/javascripts/environments/components/environment.js.es6

@@ -181,7 +181,7 @@
 
         <div class="environments-container">
           <div class="environments-list-loading text-center" v-if="isLoading">
-            <i class="fa fa-spinner spin"></i>
+            <i class="fa fa-spinner fa-spin"></i>
           </div>
 
           <div class="blank-state blank-state-no-icon"