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>

website/common/script/cron.js

@@ -257,7 +257,7 @@ export function getPlanMonths (plan) {
   // (which doesn't matter because we don't need to reapply perks
   // for them and by this point they should have expired anyway)
   if (!plan.planId) return 1;
-  const planIdRegExp = new RegExp('_([0-9]+)mo'); // e.g., matches 'google_6mo' / 'basic_12mo' and captures '6' / '12'
+  const planIdRegExp = /_([0-9]+)mo/; // e.g., matches 'google_6mo' / 'basic_12mo' and captures '6' / '12'
   const match = plan.planId.match(planIdRegExp);
   if (match !== null && match[0] !== null) {
     // 3 for 3-month recurring subscription, etc