TPA-RFC-51: Review design for localization review pipelines

It seems the weblate bot is failing to trigger pipelines in the web projects, see for example: https://gitlab.torproject.org/tpo/translation/-/pipelines/51887

I have added the weblate bot to the team members in web, with role of Developer: https://gitlab.torproject.org/groups/tpo/web/-/group_members and I see that the 🤖 @gitolite-merge-bot has a role of 'Mantainer'. But I am not sure if giving the role of mantainer to an external entity for our websites is a good idea, as the weblate bot could be hijacked and modify our websites.

I need to investigate (i.e. ask @lavamind ) how can I allow the weblate bot to run pipelines in tpo/web without being a mantainer.