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Fix pipelines not always being created after a push
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31741 introduced a regression where not all the right parameters would be passed into `Ci::CreatePipelineService`. We fix this by breaking out the pipeline parameters and reusing a method from `Gitlab::DataBuilder::Push`. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/66196