WIP: [EE] Use merge request pipelines with change detection (QA changes only)

Rémy Coutablerequested to merge
use-merge-request-pipeline-with-change-detection-qa into use-merge-request-pipeline-with-change-detection

For testing purpose of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/15761.

Edited by Rémy Coutable

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