Stop replacing `$your_email` with the user's email in the `/help` pages

See merge request !8014

Remove 'Leave Project' and 'Leave Group' from settings dropdowns

## What does this MR do?

Removes `Leave Project` and `Leave Group` from the settings dropdown.

Adds it to the `views/shared/members/access_request_buttons.html.haml`.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

## Screenshots (if relevant)

![Screen_Shot_2016-11-19_at_15.34.26](/uploads/5c66a025513b4780a9e881f0036381e4/Screen_Shot_2016-11-19_at_15.34.26.png)
![Screen_Shot_2016-11-19_at_15.35.29](/uploads/ed74a5dfe982cf65bb49c0c4fb307061/Screen_Shot_2016-11-19_at_15.35.29.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/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #23305

See merge request !7600

Updated members dropdowns

## What does this MR do?

EE has different dropdowns to allow for group LDAP members to be overridden, this ports the dropdown changes over to reduce conflicts.

## Screenshots (if relevant)

![Screen_Shot_2016-12-07_at_15.28.20](/uploads/6cb6def34015b024dc878aa3b99be4a0/Screen_Shot_2016-12-07_at_15.28.20.png)

See merge request !7974

Resolve "Provide SVG as a prop instead of hiding and copy them in environments table"

## What does this MR do?
- Provides SVG as a prop instead of manually manipulate the DOM to show it 
- Uniforms all props names in environments related components, 3 formats were being used and it was error prone
- Adds tests for the new SVG props.

## Why was this MR needed?
Technical debt.

## 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/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] 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)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #25374

See merge request !7992

The `$your_email` was removed from the SSH doc.

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

fix features_visibility_spec.rb

remove strange part of spec

fix conditions of comments tab disappearing and fix spec

generate changelog

rewrite spec for more coplex check step-by-step

move conditional logic into helper and fix changelog

fix indentation in helper

Remove wrong '.builds-feature' class from the MR settings fieldset

Closes #25171

See merge request !7930

Closes #24982

See merge request !7837