We have a [customer request](https://gitlab.com/gitlab-org/gitlab/-/issues/335558) to include `deployment_tier` to the pipeline webhook event payload. In this [MR](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66744) we are making changes for the same.

Changelog: changed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66744