refactor: Workers and queues and eliminate redundant process listeners

packages/backend/src/queues/email.js

@@ -11,10 +11,6 @@ const redisConnection = {
 
 const emailQueue = new Queue('email', redisConnection);
 
-process.on('SIGTERM', async () => {
-  await emailQueue.close();
-});
-
 emailQueue.on('error', (error) => {
   if (error.code === CONNECTION_REFUSED) {
     logger.error(