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/unit/models/newsPost.js

@@ -103,7 +103,7 @@ describe('NewsPost Model', () => {
 
     beforeEach(async () => {
       // Delete all existing posts from the database
-      await NewsPost.remove();
+      await NewsPost.deleteMany();
     });
 
     afterEach(() => {
@@ -116,7 +116,7 @@ describe('NewsPost Model', () => {
         _id: v4(), publishDate: new Date(), published: true,
       };
       NewsPost.updateLastNewsPost(previousPost);
-      intervalId = refreshNewsPost(50); // refreshes every 50ms
+      intervalId = refreshNewsPost(100); // refreshes every 100ms
 
       await sleep(0.1); // wait 100ms to make sure the new post has a more recent publishDate
       const newPost = await NewsPost.create({