Added blank state to issues
## What does this MR do?
Adds new blank state to issues when no issues exist.
Part of #18519
## Screenshots (if relevant)

See merge request !4908
- Group / project members cannot request access
- Group members cannot request access to a group's project
This addresses an issue where project owners could request access
to their own project, leading to UI inconsistency where their requester
status would replace their owner status.
Signed-off-by: Rémy Coutable <remy@rymai.me>
Fixed URL on label button when filtering
## What does this MR do?
Gives the filtered labels the correct URL. Previously they tried to link to `labels#show` whereas now it links to the correct filter path.
## What are the relevant issue numbers?
Closes#19005
See merge request !4897
Hide nav arrows by default
## What does this MR do?
- Fixes the arrow icon flashing on page load
- Removes settings dropdown at higher breakpoint
- Removes unneeded CSS
Closes#18941
## Screenshots (if relevant)
Arrow flashing bug:

Settings dropdown breaking nav:
<img src="/uploads/4351035f4cf8cb9fd892b621e6339e50/Screen_Shot_2016-06-21_at_4.25.50_PM.png" width="800px">
@alfredo1 would you mind double checking this to make sure the arrow flashing is definitely not happening?
See merge request !4843
Display group/project access requesters separately in admin
## What does this MR do?
It displays the access requesters in a separate list in group & project members pages.
It also harmonize the members counter UI to use `%span.badge` everywhere (in the admin & non-admin members views).
## Are there points in the code the reviewer needs to double check?
No.
## Why was this MR needed?
To not confuse access requesters with actual members.
## What are the relevant issue numbers?
Closes#18871.
## Screenshots
### Group members
| Before | After |
| --------- | ---- |
|  |  |
### Project members
| Before | After |
| --------- | ---- |
|  |  |
### Admin group members
| Before | After |
| --------- | ---- |
|  |  |
### Admin project members
| Before | After |
| --------- | ---- |
|  |  |
## Does this MR meet the acceptance criteria?
- [x] No CHANGELOG since this is related to the original "request access" MR.
- [ ] 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 !4798
Fixed private forks notice position in forks list
Moves the private forks notification item into the list on the forks page.
Closes#17671.
See merge request !4573
Add merge request data to the progress information on Milestones pages.
## What does this MR do?
Adds data about merge requests to the Milestone show view. It previously only showed something like `3 issues: 2 open and 1 closed 20% complete`, now it shows `3 issues: 2 open and 1 closed 2 merge requests: 2 open and 0 merged 20% complete`.
## Are there points in the code the reviewer needs to double check?
I don't think so.
## Why was this MR needed?
The milestone progress % didn't accurately reflect the open/merged MRs.
## What are the relevant issue numbers?
Fixes#13980
## Screenshots (if relevant)
Before:

After:

## Does this MR meet the acceptance criteria?
- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [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)
cc: @jschatz1
See merge request !4719
Implement custom notification level options


part of #12758
See merge request !4389
Ensure that group owner cannot request access to a project of their group
## What does this MR do?
It fixes two things:
- 91ad995d69e1a0f8991fd896f1d9febc109273fe Ensure that group owner cannot request access to a project of their group
- ec3ff061148d556757e7cd486cdc6083d77acf34 Ensure group/project owners can see their members' access_level (see the commit message for details)
## Are there points in the code the reviewer needs to double check?
Not really, these are pretty simple fixes.
## Why was this MR needed?
Because there was an issue created!
## What are the relevant issue numbers?
Fixes#18717.
## Does this MR meet the acceptance criteria?
- [x] CHANGELOG is not needed since the bug is only present in a 8.9 RC
- [x] Tests
- [x] Added for this feature/bug
- [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 !4729
- Make it more explicit that `source` must respond to `#group` and that
`#group` must be present.
- Indent subsequent lines of a multi-line condition.
Signed-off-by: Rémy Coutable <remy@rymai.me>
When you are the last owner of a group or the owner of a project,
you don't have the :update_<source>_member / :destroy_<source>_member
abilities, but you do have the :admin_<source>_member so you should
be able to see your members access levels.
Signed-off-by: Rémy Coutable <remy@rymai.me>