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

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

test/api/v3/integration/challenges/POST-challenge_flag.test.js

@@ -41,7 +41,7 @@ describe('POST /challenges/:challengeId/flag', () => {
   });
 
   it('flags a challenge with a higher count when from an admin', async () => {
-    await user.update({ 'contributor.admin': true });
+    await user.updateOne({ 'contributor.admin': true });
 
     const flagResult = await user.post(`/challenges/${challenge._id}/flag`);