move process.env.BACKEND to setup.js

services/docstore/test/acceptance/js/ArchiveDocsTests.js

@@ -12,7 +12,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-process.env.BACKEND = 'gcs'
+
 const Settings = require('@overleaf/settings')
 const { expect } = require('chai')
 const { db, ObjectId } = require('../../../app/js/mongodb')

services/docstore/test/setup.js

@@ -4,6 +4,8 @@ const sinonChai = require('sinon-chai')
 const chaiAsPromised = require('chai-as-promised')
 const SandboxedModule = require('sandboxed-module')
 
+process.env.BACKEND = 'gcs'
+
 // Chai configuration
 chai.should()
 chai.use(sinonChai)