Update ReactiveCache call sites to use async/await for Meteor 3.0

Part 3 of ReactiveCache async migration:
- Add await before all ReactiveCache.getX() calls
- Make functions containing ReactiveCache calls async
- Convert forEach/map/filter loops with async callbacks to for...of
- Update model helpers, Meteor methods, JsonRoutes handlers
- Update collection hooks (.before/.after insert/update/remove)
- Update .allow() callbacks to async

Files updated across models/ and server/ directories:
- Model files: cards, boards, lists, swimlanes, activities, users,
  checklists, checklistItems, customFields, attachments, integrations,
  cardComments, settings files, creators, exporters, and more
- Server files: publications, methods, notifications, routes, migrations

server/publications/users.js

@@ -1,9 +1,9 @@
-Meteor.publish('user-miniprofile', function (usernames) {
+Meteor.publish('user-miniprofile', async function (usernames) {
   check(usernames, Array);
 
   // eslint-disable-next-line no-console
   // console.log('usernames:', usernames);
-  const ret = ReactiveCache.getUsers(
+  const ret = await ReactiveCache.getUsers(
     {
       $or: [
         { username: { $in: usernames } },
@@ -33,9 +33,9 @@ Meteor.publish('user-admin', function () {
   return ret;
 });
 
-Meteor.publish('user-authenticationMethod', function (match) {
+Meteor.publish('user-authenticationMethod', async function (match) {
   check(match, String);
-  const ret = ReactiveCache.getUsers(
+  const ret = await ReactiveCache.getUsers(
     { $or: [{ _id: match }, { email: match }, { username: match }] },
     {
       fields: {
@@ -50,7 +50,7 @@ Meteor.publish('user-authenticationMethod', function (match) {
 });
 
 // Secure user search publication for board sharing
-Meteor.publish('user-search', function (searchTerm) {
+Meteor.publish('user-search', async function (searchTerm) {
   check(searchTerm, String);
 
   // Only allow logged-in users to search for other users
@@ -62,7 +62,7 @@ Meteor.publish('user-search', function (searchTerm) {
   const searchRegex = new RegExp(searchTerm, 'i');
 
   // Search for users by username, fullname, or email
-  const ret = ReactiveCache.getUsers(
+  const ret = await ReactiveCache.getUsers(
     {
       $or: [
         { username: searchRegex },