Evaluate allow skipped pipeline checkbox visibility
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=220695) </details> <!--IssueSummary end--> ## 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. ![Screen_Shot_2020-06-07_at_2.09.12_PM](/uploads/9d50f6c361b39fe794247ee9eb84791e/Screen_Shot_2020-06-07_at_2.09.12_PM.png) 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 ![20200602_bootstrap_collapsible_bug](/uploads/a4fab27800191bd51210dec7f535b6d4/20200602_bootstrap_collapsible_bug.mp4) Let's reevaluate the best way to show this checkbox.
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