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/controllers/api-v3/pushNotifications.js

@@ -46,7 +46,7 @@ api.addPushDevice = {
 
     // Concurrency safe update
     const pushDevice = (new PushDevice(item)).toJSON(); // Create a mongo doc
-    await user.update({
+    await user.updateOne({
       $push: { pushDevices: pushDevice },
     }).exec();
 
@@ -92,7 +92,7 @@ api.removePushDevice = {
 
     // Concurrency safe update
     const pullQuery = { $pull: { pushDevices: { regId } } };
-    await user.update(pullQuery).exec();
+    await user.updateOne(pullQuery).exec();
 
     // Update the response
     pushDevices.splice(indexOfPushDevice, 1);