Merge pull request #14881 from overleaf/ab-beta-program-async-await

[web] Convert BetaProgramController to async/await

GitOrigin-RevId: 2423cb00b78b2f3fddb7bcd317d34ed4dbc12b95

services/web/app/src/Features/BetaProgram/BetaProgramHandler.js

@@ -17,15 +17,11 @@ async function optOut(userId) {
   AnalyticsManager.setUserPropertyForUser(userId, 'beta-program', false)
 }
 
-const BetaProgramHandler = {
+module.exports = {
   optIn: callbackify(optIn),
-
   optOut: callbackify(optOut),
+  promises: {
+    optIn,
+    optOut,
+  },
 }
-
-BetaProgramHandler.promises = {
-  optIn,
-  optOut,
-}
-
-module.exports = BetaProgramHandler