Fix backend lint errors

.eslintrc.json

@@ -20,6 +20,7 @@
   "rules": {
     "no-console": "off",
     "react/no-unescaped-entities": "off",
+    "no-async-promise-executor": "off",
     "prettier/prettier": "error"
   }
 }

services/backend/src/app.js

@@ -9,7 +9,6 @@ const { PORT } = conf
 const { initializeDatabaseConnection } = require('./database/connection')
 const { dbConnections } = require('./databaseV2/connection')
 
-const IS_PRODUCTION = process.env.NODE_ENV === 'production'
 const SENTRY_ENVIRONMENT = process.env.SENTRY_ENVIRONMENT || ''
 const SENTRY_RELEASE = process.env.SENTRY_ENVIRONMENT || ''