The VisualEditor backend on WMF production sites should no longer use RESTbase.
Rationale: This will remove one of the primary consumers of the parsoid endpoints on RESTbase, and one of two reason we need to store pre-generated parsoid output on restbase (the other reason being PCS, for now).
[x] beta (some) T320531
[x] testwiki ~~and labtestwiki~~ T320531
[ ] officewiki
[x] labswiki (aka wikitech)
[x] mediawikiwiki
[x] hewiki
[x] [[https://phab.wmfusercontent.org/file/data/6qjjkdpvx6xmzuxtkbx3/PHID-FILE-ucgqr3ifitimoeqlirfj/small.dblist|small]] wikis
[x] [[ https://phab.wmfusercontent.org/file/data/pjuzksk7p4n2tgn4mcw4/PHID-FILE-ghgd3jxwa775mj7ke64l/medium.dblist | medium ]] wikis
[x] enwiki
[x] all wikis
Relevant configuration:
```lang=php
$wmgUseRestbaseVRS= false;
```
NOTE: Notify the community via TechNews when this is happening!