Be able to assign an issue and MR to the person opening it

And not just the group + project members.

This because people can open issues on public project of which they are not a member.

The action of assigning should still be restricted to the project + group members.

Title changed from Be able to assign an issue to the person opening it to Be able to assign an issue and MR to the person opening it

mentioned in issue #8938 (moved)

mentioned in merge request !2765 (merged)

Reassigned to @zj

Milestone changed to 8.7

Status changed to closed by merge request !2765 (merged)

mentioned in commit df27b3a1

mentioned in commit bb59a1f9