https://jiraeu.epam.com/browse/GONRG-385

* Removed redundant variables and annotations
* Renamed test classes, so they could run from maven goals
* Added maven support to run junit-jupiter tests
* Added GCP implementation for integration tests. Used os-storage as a source for code
* Added some test data needed for submitWithManifest workflow
* Added core logic for integration tests
* Created pom structure for integration tests
* Renamed test module from ingest-test-core to ingest-test-utils as it overlaps with integration tests structure conventions and is used for unit tests