GitLab

Cycle analytics second iteration frontend

## Are there points in the code the reviewer needs to double check?
Mostly typos and code guidelines.

## Why was this MR needed?
This implements the frontend part of !6859 for #23449

## Screenshots

**Initial view**
![Screen_Shot_2016-11-21_at_5.28.43_PM](/uploads/ff9cfa9c9d6c2da28c24e03e384f89af/Screen_Shot_2016-11-21_at_5.28.43_PM.png)

**Cycle Analytics with data**
![Screen_Shot_2016-11-21_at_2.09.24_PM](/uploads/18d9786c090bdd554cf786c879543302/Screen_Shot_2016-11-21_at_2.09.24_PM.png)

**User doesn't have access for a stage**
![Screen_Shot_2016-11-21_at_2.11.01_PM](/uploads/d1ea76a63f2de2224954b5f40038c488/Screen_Shot_2016-11-21_at_2.11.01_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/d...