While porting this to webpack, I couldn't help but notice how redundant this is.
It adds indirection to our code and provides additional convenience methods such as inUserBucketA, getGroups and getEditCount
We should explore porting those 3 methods to core if they are useful or removing them from our codebase entirely.
= Acceptance criteria
 inUserBucketA not used by Minerva or MobileFrontend. Remove it.
 getGroups not used by Minerva or MobileFrontend. Remove it.
 Update existing usages of the user module to use mw.user
= Developer notes
It seems the edit count is most frequently used for bucketed editing counts. A bucketed and standardised edit count in core would be super useful to support existing and future schemas. Instead of upstreaming `getEditCount ` we might instead choose to upstream `getEditBucket` from Popups. We'd need to update MobileWebMainMenuClickTracking to use an edited bucket count. See T210106.