Request review from testeng on auto PRs
Right now we comment for a testeng review, newer versions of PyGithub seem to allow actually creating a review request which should be more noticeable for us.
Steps to Reproduce
Reason for Variance
User Impact Summary
Extracted the reviewer settings into the DSL to make it broader than just tagging testeng.
Also documented how to setup a new repository here: https://openedx.atlassian.net/wiki/spaces/TE/pages/989135321/Adding+repositories+for+auto+python+dependency+management