test: Fix flaky test (#10303)

Author: mtrezza

spec/ParseUser.spec.js

@@ -359,9 +359,6 @@ describe('Parse.User testing', () => {
       uri: databaseURI,
     });
     await adapter.connect();
-    await adapter.database.dropDatabase();
-    delete adapter.connectionPromise;
-    Config.get(Parse.applicationId).schemaCache.clear();
 
     const user = new Parse.User();
     await user.signUp({