- `MediaWiki\Skins\Vector\Tests` is now the prefix for all tests in the skin
- we followed PSR conventions of following folder structure after the prefix
- Optimize imports/use order
- update namespace in skin.json
Bug: T303102
Change-Id: Ib76374d81d973c83adfd6c8e7863ff6d797e655d
Following on from I9445d5c, align the @package annotations in
the Vector\FeatureManagement namespace and subnamespaces.
Bug: T248399
Change-Id: Icd287a52d149123bca5d9f0c55154f932f55148e