Upgrade to mongoose 7 (#14971)

* remove some unused dependencies

* update mongoose version

* make common tests pass

* Make unit tests pass

* make api v3 integration tests pass

* fix lint issues

* fix issue with package-lock

* fix(lint): we don't need no .js

* fix(lint): update to latest config-habitrpg

* chore(npm): update package locks

* fix(test): replace deprecated fn

* chore(package): update eslint-habitrpg again

* fix(lint): server linting

* fix(lint): client linting

* fix(client): correct mangled common imports

* chore(npm): update package-locks

* fix(lint): punctuation, module

---------

Co-authored-by: SabreCat <sabrecat@gmail.com>
Co-authored-by: SabreCat <sabe@habitica.com>

website/server/models/user/hooks.js

@@ -404,10 +404,6 @@ schema.pre('save', true, function preSaveUser (next, done) {
   }
 });
 
-schema.pre('update', function preUpdateUser () {
-  this.update({}, { $inc: { _v: 1 } });
-});
-
 schema.pre('updateOne', function preUpdateUser () {
   this.updateOne({}, { $inc: { _v: 1 } });
 });