Fix build notification on merge request page change even if the build status didn't change
## What does this MR do?
This MR contains a bugfix for #17357 which was introduced by !3998. The notification are now only shown on status changes, and not when switching between different merge requests.
## Are there points in the code the reviewer needs to double check?
Check implementation
## Why was this MR needed?
Because auf a bug introduced in !3998.
## What are the relevant issue numbers?
#17357Closes#17357
See merge request !4086
Fix build notification on merge request page change even if the build status didn't change
## What does this MR do?
This MR contains a bugfix for #17357 which was introduced by !3998. The notification are now only shown on status changes, and not when switching between different merge requests.
## Are there points in the code the reviewer needs to double check?
Check implementation
## Why was this MR needed?
Because auf a bug introduced in !3998.
## What are the relevant issue numbers?
#17357Closes#17357
See merge request !4086
Merge request widget displays TeamCity build state and code coverage correctly again
## What does this MR do?
This MR contains a fix for a regression introduced in `8.7`. In former version, the TeamCity build status was always displayed correctly. In `8.7` the build state is still checked, but the UI is not updated correctly any longer.
## Are there points in the code the reviewer needs to double check?
The changes are quite simple, so please simply double check them.
## Why was this MR needed?
This MR is needed to make the TeamCity build status working again.
## What are the relevant issue numbers?
#17080
See merge request !3998
Load the "New Branch" button asynchronously
Here's how it looks like for logged in users:

And here it is for anonymous users (or when a new branch can't be created by a logged in user):

See merge request !3855
Fixes issue with emoji comments not showing correct emoji image
Previously it would look for the unicode character inside the award menu. But this menu might not always be there.
Now, the unicode characters are loaded onto the page in an array which the award emoji that looks in to get the correct emoji unicode character
Fixes#15512
See merge request !3885
Fixes text color on labels in sidebar
Previously the labels in the sidebar would just have `#FFF` text color which could cause problems with a light background color.
With this, the text color comes from the JSON.
See merge request !3846
Fixed issue with sidebar edit links toggling anchor
This caused an issue with the page scrolling from the bottom to the top. Also stopped the dropdown links doing the same.
See merge request !3819
Scroll to the last comment I made and edit it.
Pressing up in an empty comment box will edit your last comment.
Also now when you click edit on a comment it will put the cursor at the end.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/15267

See merge request !3757
Issuable can be assigned to author
Closes#9014
The only difference with #9014 is that I thoughed the author should also be
able to assign the issue. If this is unwanted behavior Ill revert it.
/cc @DouweM
See merge request !2765