Problem: Show merge requests for any repo under repos/releng/* that are NOT by anyone in RelEng
This tells us if we have things we need to review for others. In Gerrit, I can do a search like -ownerin:"Release Engineering"
In GitLab, I tried filtering out all of the users who are relengers using a very long query[0]. But this search only seems to honor the last author instead of ANDing the conditions together.