Remove redundant CHANGELOG entry

This was moved into v7.10.4, but I forgot to delete it from the v7.11 list.

See merge request !692

Add support for Webhook note events

This MR adds support for note events (comments) for WebHooks.

Perhaps the only potential source of confusion is that the settings indicates "Note Events" instead of "Comments". What do you think?

Screenshot after:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/299b141d82f7b14943a74258d5c57ca6/image.png)

Closes https://github.com/gitlabhq/gitlabhq/issues/6745

See merge request !673

Use the user list from the target project in a merge request

### What does this MR do?

This MR derives the assignable users from the target project.

### Why was this MR needed?

In a merge request, the assignable users uses the list from the forked project, not the target project where the merge request will be going. For example, if I fork a project from the gitlab-org namespace into my personal namespace, make some changes, and then create a merge request, the only users I see are me. I think it makes more sense to show all the users in gitlab-org. This is a regression caused by 1c2711f.

### What are the relevant issue numbers?

Closes #1535

See merge request !682