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/middlewares/cron.js

@@ -30,7 +30,7 @@ async function checkForActiveCron (user, now) {
 
   // If the cron signature is already set, cron is running in another request
   // throw an error and recover later,
-  if (userUpdateResult.nMatched === 0 || userUpdateResult.nModified === 0) {
+  if (userUpdateResult.matchedCount === 0 || userUpdateResult.modifiedCount === 0) {
     throw new Error('CRON_ALREADY_RUNNING');
   }
 }
@@ -72,7 +72,6 @@ async function cronAsync (req, res) {
       await unlockUser(user);
       return null;
     }
-
     const tasks = await Tasks.Task.find({
       userId: user._id,
       $or: [ // Exclude completed todos
@@ -100,7 +99,7 @@ async function cronAsync (req, res) {
     // Clear old completed todos - 30 days for free users, 90 for subscribers
     // Do not delete challenges completed todos TODO unless the task is broken?
     // Do not delete group completed todos
-    Tasks.Task.remove({
+    Tasks.Task.deleteMany({
       userId: user._id,
       type: 'todo',
       completed: true,