23545 Fix distorted project and group avatars

## What does this MR do?
Wraps project and group avatars in image container to prevent distortion

## Are there points in the code the reviewer needs to double check?
- Group/project lists
- Group/project pages
- Group/project admin pages
- Group/project edit pages

## Screenshots (if relevant)

### Before
![Screen_Shot_2016-10-31_at_12.35.42_PM](/uploads/abaeef7ded89abbba7e08be686c9a609/Screen_Shot_2016-10-31_at_12.35.42_PM.png)

### After
![Screen_Shot_2016-10-31_at_12.35.28_PM](/uploads/cafe1b096cf66afde7f346e5610bf3f3/Screen_Shot_2016-10-31_at_12.35.28_PM.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry 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
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] 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 #23545

See merge request !7206