The deprecation work has now completed and the repository has been archived here: GitHub - openedx-unsupported/tubular: A repo for edx pipeline related scripts.
Most scripts that are still relevant to the Open edX Community were moved to the edx-platform repo as a part of Move user retirement code to edx-platform and drop it from Tubular · Issue #881 · openedx/axim-engineering · GitHub
The retirement and mongo pruning scripts can be found under the scripts directory in edx-platform.