During a security release, RMs sometimes have to run the `run release merge --security --default-branch` multiple times in a short duration. Currently, each time the command is executed, a new MWPS pipeline is started for open MRs. When merging the default branch MR of a security issue, release-tools starts a new pipeline and sets MWPS. However, if a pipeline is already ongoing, we should not start a new one since pipelines can take an hour to complete. The change probably needs to be in [security/merge_when_pipeline_succeeds_service.rb#L13](https://gitlab.com/gitlab-org/release-tools/-/blob/760b014e21573311f1b9de7e466f560ff42d8e3b/lib/release_tools/security/merge_when_pipeline_succeeds_service.rb#L13).