Delete review-prep-bucket job

Chad Woolleyrequested to merge
delete-reivew-prep-bucket-job into master

What does this MR do?

Delete review-prep-bucket job. It is not as necessary anymore now that we are migrating to having each partial build job deploy its own assets, and has the possibility of causing problems if it overwrites new MR files due to a race condition because it is in the same build stage.

Related issues

Relates #8302 (closed)

Merge request reports