I have found out a few extensions that are apparently deployed to Wikimedia but have their CI jobs relying on composer to install dependencies. They should be switched to use `mediawiki/vendor` instead.
There is at least:
* MachineVision
* PropertySuggester
* WikibaseQualityConstraints
* WikibaseJavaScriptApi
* WikibaseQuality
* WikibaseQualityExternalValidation
They are configured in integration/config with the composer variant of the job, and there is even a FIXME for them. Example:
```
lang=yaml,name=zuul/layout.yaml
- name: mediawiki/extensions/MachineVision
template:
# FIXME: Document why this is using the composer variant.
- name: extension-quibble-composer
```
That should be `extension-quibble-vendor`, or due to T232759:
```
- extension-quibble-noselenium
- extension-quibble-only-selenium
```