Signed-off-by: NRémy Coutable <remy@rymai.me>

Added CHANGELOG item

Sites that use http:// for the external_url should always display HTTP on
the clone bar. Similarly, sites that use https:// should show HTTPS.

Updated the spacing throughout the sidebar so that it fits better on smaller screens
Added more participants button

Closes #13353

Moved the positioning of the dropdown to be more aligned with the title

Closes #13219 and #13214

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

This MR simplifies CI permission model:
- read_build: allows to read a list of builds, artifacts and trace
- update_build: allows to cancel and retry builds
- create_build: allows to create builds from gitlab-ci.yml (not yet implemented)
- admin_build: allows to manage triggers, runners and variables
- read_commit_status: allows to read a list of commit statuses (including the overall of builds)
- create_commit_status: allows to create a new commit status using API

Remove all extra methods to manage permission.
Made all controllers to use explicitly the new permissions.

When clicking the current project name, it shows a dropdown menu with a list of all projects for that group or user

When rendering the clone page, check user profile to decide default clone protocol. If the user has uploaded SSH-keys, use SSH; otherwise, use http(s). Close #3504.

Closes #3585

- Enable CI by default for all new projects