Due to a bug in `BoardPolicy`, users were getting back a 403 error when
trying to assign users to an assignee list and seeing "Something went
wrong while fetching assignees list". For some reason, the declarative
policy runtime was ignoring the ternary condition.
To work around the issue, we make the project board an explicit
condition check.
Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/9727
This is allowed for existing instances so we don't end up 76 offenses
right away, but for new code one should _only_ use this if they _have_
to remove non database data. Even then it's usually better to do this in
a service class as this gives you more control over how to remove the
data (e.g. in bulk).
The closed & backlog lists in issue boards are no collapsible. They can
be collapsed independently of each other & this selection is then saved
to the browser through localStorage. When the page loads, the code gets
the data from localStorage & determines whether to show or hide the list
Closes#23917
