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>

test/api/v3/integration/tasks/POST-tasks_unlink-all_challengeId.test.js

@@ -104,7 +104,6 @@ describe('POST /tasks/unlink-all/:challengeId', () => {
       id: challenge._id,
       shortName: challenge.shortName,
       broken: 'CHALLENGE_DELETED',
-      winner: null,
     });
   });
 });