Add API support for admin setting to 'bypass placeholder confirmation'
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=545243) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=545243) </details> <!--IssueSummary end--> This issue was created from the suggestion https://gitlab.com/gitlab-org/gitlab/-/merge_requests/188810#note_2493727674. ### About We should add API support for the new `allow_enterprise_bypass_placeholder_confirmation` boolean application setting being added in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/188810 as part of https://gitlab.com/gitlab-org/gitlab/-/issues/534329.
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