Upgrade tests tools and lint migrations and scripts (part 2) (#9998)

* upgrade gulp-babel

* upgrade babel-eslint

* upgrade eslint-friendly-formatter

* start upgrading chai

* start to upgrade eslint

* restore skipped tests

* start to upgrqde monk

* fix linting and remove unused file

* fix mocha notifications, and common tests

* fix unit tests

* start to fix initrgration tests

* more integration tests fixes

* upgrade monk to latest version

* lint /scripts

* migrations: start moving to /archive unused migrations and run eslint with --fix

* lint migrations

* fix more integration tests

* fix test

migrations/utils/connect.js

@@ -3,7 +3,7 @@
 const MongoClient = require('mongodb').MongoClient;
 const logger = require('./logger');
 
-let db;
+let dbConnection;
 
 function connectToDb (dbUri) {
   return new Promise((resolve, reject) => {
@@ -13,7 +13,7 @@ function connectToDb (dbUri) {
         return reject(err);
       }
 
-      db = database;
+      dbConnection = database;
 
       logger.success(`Connected to ${dbUri}`);
 
@@ -23,7 +23,7 @@ function connectToDb (dbUri) {
 }
 
 function closeDb () {
-  if (db) db.close();
+  if (dbConnection) dbConnection.close();
 
   logger.success('Closed connection to the database');
   return Promise.resolve();
@@ -32,4 +32,4 @@ function closeDb () {
 module.exports = {
   connectToDb,
   closeDb,
-}
+};