Evaluate allow skipped pipeline checkbox visibility
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## Description
(Identified in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27490#note_356817574)
This MR https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27490 introduces a checkbox in project settings to allow skipped pipelines in `Pipelines must succeed` is checked.

This checkbox only makes a difference if the `Pipelines must succeed` is checked and ideally we wouldn't show a checkbox which doesn't do anything. We first tried to implement this collapse/show with Bootstrap UI, but it had some unacceptable quirks

Let's reevaluate the best way to show this checkbox.
issue