Rollout the `ci_atomic_processing` and `ci_composite_status` feature flag
### Problem to solve We merged the https://gitlab.com/gitlab-org/gitlab/issues/30656. Which is a first step towards atomic processing of pipelines. This issue is to track the rollout of the feature once we continue working on https://gitlab.com/gitlab-org/gitlab/issues/197365. ### Links / references - https://gitlab.com/gitlab-org/gitlab/issues/30656 - https://gitlab.com/gitlab-org/gitlab/issues/197365
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