Allow single server instance in test suite (#7262)

* initial pass

* reconfigureServer when needed

* finish postgres tests

* mongo tests

* more tests

* clean up

* re-add skipped test

* Fix transaction tests

* handle batch

* AuthenticationAdapter fix

* More reconfiguration

* clean up

* properly terminate cli servers

* handle Parse.Push

* Flaky PushController

* ensure reconfigureServer when changed

* fix postgres tests

* remove console.log

* LiveQuery spec remove duplicates and listeners

spec/MongoStorageAdapter.spec.js

@@ -376,15 +376,12 @@ describe_only_db('mongo')('MongoStorageAdapter', () => {
         'X-Parse-REST-API-Key': 'rest',
       };
 
-      beforeAll(async () => {
+      beforeEach(async () => {
         await reconfigureServer({
           databaseAdapter: undefined,
           databaseURI:
             'mongodb://localhost:27017/parseServerMongoAdapterTestDatabase?replicaSet=replicaset',
         });
-      });
-
-      beforeEach(async () => {
         await TestUtils.destroyAllDataPermanently(true);
       });