Add label for known issues
When some features are released, we sometimes can't cover all cases in one iteration.
This is especially true for "Security Products", where various 3rd party tools are being used.
I'd like to introduce a new label "known issue", to reference limitations of the current implementation.
I suggest having this label coupled with gitlab-ce3813855 to allow Product Managers decide if they reference this issues or not.
Ex: https://gitlab.com/gitlab-org/gitlab-ee/issues/6232#note_75971867
This is different as a gitlab-ce~2278648 because it's more of a limitation than something unexpected. The priority is also different since bugs must be fixed as soon as possible, depending on their priority/severity. We can plan to include them in a future iteration, or not.