Create workflow comments when tracking deployments in the Release Tools
Per #581 (closed) we will be moving deployment tracking to the Release Tools project. In gitlab-org/release-tools!800 (merged) we removed the creating of deployment comments and assigning workflow labels, but this merge request was merged before we reached a final decision on the matter. This is not the end of the world (we probably would have merged it anyway), but the removal of the workflow labels is a bit annoying.
When recording deployments using the Release Tools, we should also update all deployed merge requests to have the appropriate workflow labels for the environment they are currently in. These labels are:
- gstg: "workflow::staging"
- gprd-cny: "workflow::canary"
- gprd: "workflow::production"