NOTE: this will be done after {T254227} is complete and gone through full QA on production
== Background
As a part of the desktop refresh project, we would like to give logged-in users the ability to try out the new features and improvements as they are built. To do this, will be providing the new version of the vector skin as a user preference to all wikis. To learn more about our release plan, please see our project page: https://www.mediawiki.org/wiki/Reading/Web/Desktop_Improvements/Opting_in_and_Release_Plan
== Acceptance criteria
[] Deploy the new version of the vector skin to all wikis as a user preference. The skin version must be OFF by default on all wikis that are not test wikis.
[] Feature flag state:
- Preference - on
- Default - off
- Sidebar **closed** by default - off
- Sidebar instrumentation - on
- Max width - on
== Developer notes
Flip the VectorShowSkinPreferences switch