Always show "Pipelines must succeed" checkbox

What does this MR do?

Based on comment: https://gitlab.com/gitlab-org/gitlab-ce/issues/57291#note_173570331, "Pipelines must succeed" checkbox should be visible regardless the builds feature (enabled/disabled).

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/57291

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides