Create API test for data-export/export endpoint

Overview
We need to create API tests for this endpoint, to get an opportunity to cover our current and future tasks with such kind of test.

Acceptance Criteria

• Mock data, for instance, is created;
• In Setup step - put the instance type to the inventory storage;
• In Setup step - put the instance to the inventory storage;
• Write API test for data-export/export endpoint and for getting job execution and verify that export is successful with this instance;
• In the clean up step - remove the instance type from inventory storage;
• In the clean up step - remove the instance from inventory storage.