[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/support/MockEmailAdapterWithOptions.js

@@ -0,0 +1,21 @@
+module.exports = options => {
+  if (!options) {
+    throw 'Options were not provided';
+  }
+  const adapter = {
+    sendVerificationEmail: () => Promise.resolve(),
+    sendPasswordResetEmail: () => Promise.resolve(),
+    sendMail: () => Promise.resolve(),
+  };
+  if (options.sendMail) {
+    adapter.sendMail = options.sendMail;
+  }
+  if (options.sendPasswordResetEmail) {
+    adapter.sendPasswordResetEmail = options.sendPasswordResetEmail;
+  }
+  if (options.sendVerificationEmail) {
+    adapter.sendVerificationEmail = options.sendVerificationEmail;
+  }
+
+  return adapter;
+};