Evaluate allow skipped pipeline checkbox visibility

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Description

(Identified in !27490 (comment 356817574))

This MR !27490 (merged) 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

20200602_bootstrap_collapsible_bug

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