Postgres: Properly initialize database on startup and debugger (#7255)

* PG: Properly initialize database

* fix flaky tests

* flaky test

* correct test

* no idea

* clean up debugger

spec/batch.spec.js

@@ -1,6 +1,5 @@
 const batch = require('../lib/batch');
 const request = require('../lib/request');
-const TestUtils = require('../lib/TestUtils');
 const semver = require('semver');
 
 const originalURL = '/parse/batch';
@@ -187,10 +186,6 @@ describe('batch', () => {
         }
       });
 
-      beforeEach(async () => {
-        await TestUtils.destroyAllDataPermanently(true);
-      });
-
       it('should handle a batch request with transaction = true', done => {
         const myObject = new Parse.Object('MyObject'); // This is important because transaction only works on pre-existing collections
         myObject