Namespace license checks for multiple issue boards

Related to https://gitlab.com/gitlab-org/gitlab-ee/issues/2335

Multiple issue boards (EES / Bronze)

1. Do not show Create a new board. This will allow people who already have existing multiple boards to keep using them.

2. Or show link but redirect to payment page

Introduced in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/782 by @dbalexandre and @iamphill

mentioned in issue #2568 (closed)

@dbalexandre How much effort do you estimate it will take to find all places that touch multiple issue boards and add project.feature_available?(:multiple_issue_boards) checks to them (both on frontend and backend), so that this feature can be turned off for a specific project in its entirety by having that method return false?

mentioned in issue #2335 (closed)

@DouweM I'd say 4-6 hours to be thorough. @iamphill What do you think?

@dbalexandre @DouweM Frontend wouldn't be too difficult, so it would be much less than that for the frontend work. Maybe 1-2 hours for frontend work.

assigned to @reprazent

mentioned in merge request !2317 (merged)

@reprazent

Hmm, in https://gitlab.com/gitlab-org/gitlab-ee/issues/2567#note_31539943 we have the same issue with trials. The user could take a trial and create all the issue boards he ever plans to use.

@DouweM

SO in that case we should limit it to 1, and show some kind of warning saying there are more, but they are unavailable because of the license

closed via merge request !2317 (merged)

mentioned in commit a78f01e7