Add a download buttons for Build Artifacts
## What does this MR do?
This MR adds a download buttons for build artifacts of latest succesful pipeline in:
- dashboard of project,
- branches and tags views,
- and tree viewer
Implement #4255
## What are the relevant issue numbers?
Closes #4255, Closes #14419
## Screenshots
### Project main
### Branches
### Tags
### Source Tree
## Does this MR meet the acceptance criteria?
- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] Download buttons
- [x] Models
- [x] Routes
- [x] Projects::ArtifactsController
- [x] API
- Tests
- Rails
- [x] Project#builds_for
- [x] branch name with slashes
- [x] only success builds
- [x] only latest builds
- [x] feature tests for download buttons
- API
- [x] branch name with slashes
- [x] only success builds
- [x] only latest builds
- [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 !5142
Add new icon for created pipeline ## What does this MR do? Adds new icon for `created` status ## Screenshots (if relevant)  ## What are the relevant issue numbers? Closes #21520 See merge request !6108
User can edit closed MR with deleted fork ## What does this MR do? User can edit closed MR with deleted fork (can't change "Target branch"). When fork is deleted "Reopen" button is hidden. ## What are the relevant issue numbers? Closes #19315 ## Screenshots (if relevant) * hidden Reopen button and information about deleted fork  * editable fields for closed MR without fork  ## 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] 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) cc @ubudzisz @yorickpeterse @grzesiek @tmaczukin See merge request !5496
Add test for closed MR without fork Add view test visibility of Reopen and Close buttons Fix controller tests and validation method Fix missing space Remove unused variables from test closed_without_fork? method refactoring Add information about missing fork When closed MR without fork can't edit target branch Tests for closed MR edit view Fix indentation and rebase, refactoring
Change logo animation to CSS ## What does this MR do? Converts the tanuki logo animation from javascript to CSS. You can now animate the tanuki svg logo by adding the CSS Class `animate`to it. ## Are there points in the code the reviewer needs to double check? Just need to double check for browser compatibility ## Why was this MR needed? * Using CSS for simple animations is a best practice (Optimizes DOM, uses GPU to do animation rather than CPU) * Happy DOM :balloon: ## What are the relevant issue numbers? Closes #20607 ## Screenshots (if relevant) Before DOM  After DOM  Before  After (Basically the same, hard to tell in my gif though because it was hard to get the timings right on the recording)  ## Does this MR meet the acceptance criteria? - [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added - Tests - [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 !5655