[WIP] Enable test suite to be randomized (#7265)

* initial run

* Update ParseGraphQLServer.spec.js

* temporarily enable reporter

* Bump retry limit

* fix undefined database

* try to catch error

* Handle LiveQueryServers

* Update Config.js

* fast-fail false

* Remove usage of AppCache

* oops

* Update contributing guide

* enable debugger, try network retry attempt 1

* Fix ldap unbinding

* move non specs to support

* add missing mock adapter

* fix Parse.Push

* RestController should match batch.spec.js

* Remove request attempt limit

* handle index.spec.js

* Update CHANGELOG.md

* Handle error: tuple concurrently updated

* test transactions

* Clear RedisCache after every test

* LoggerController.spec.js

* Update schemas.spec.js

* finally fix transactions

* fix geopoint deadlock

* transaction with clean database

* batch.spec.js

spec/Parse.Push.spec.js

@@ -2,10 +2,15 @@
 
 const request = require('../lib/request');
 
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
 const pushCompleted = async pushId => {
-  let result = await Parse.Push.getPushStatus(pushId);
+  const query = new Parse.Query('_PushStatus');
+  query.equalTo('objectId', pushId);
+  let result = await query.first({ useMasterKey: true });
   while (!(result && result.get('status') === 'succeeded')) {
-    result = await Parse.Push.getPushStatus(pushId);
+    await sleep(100);
+    result = await query.first({ useMasterKey: true });
   }
 };