To prepare for upstream changes, we need to drop the revision view fields: `rev_text_id`, `rev_content_model`, and `rev_content_format` and the archive view fields: `ar_text_id`, `ar_content_model`, and `ar_content_format`
These are apparently not being updated upstream already. This also needs to include the definition of all derivative views, including the _userindex views and the _compat views (if they are affected, and they likely are)
[x] Announce the change (2 weeks out)
[] Prep the patch for review around the same time
[] Merge the patch just before deploy unless a new wiki request comes down the pipe
[] Beginning on 2020-05-25, depool the replicas and run the maintain-views script one at a time on each replica host, across all wikis
[] Repool and check everything.