GCP Flexible ENV VARS (DE_OPS_TESTER, DE_ADMIN_TESTER, DE_EDITOR_TESTER, DE_NO_ACCESS_TESTER) ingestion logic (GONRG-1111)

Description:

• New core-test-gcp lib plugged in, utility class org.opengroup.osdu.gcp.workflow.util.DecodedContentExtractor involved;
• When treat ENV VARS DE_OPS_TESTER, DE_ADMIN_TESTER, DE_EDITOR_TESTER, DE_NO_ACCESS_TESTER use DecodedContentExtractor to analyze and properly interpret their values (content or filename; plain or base64 encoded);
• Variables treatment process extended logging;

Closes EPAM GONRG-1111 "Pass secrets into Ingestion Services as base64 encoded string" for Notification service

How to test:

• Run CICD and check osdu-int-test job.

Changes include:

• Refactor (a non-breaking change that improves code maintainability).
• Bugfix (a non-breaking change that solves an issue).
• New feature (a non-breaking change that adds functionality).
• Breaking change (a change that is not backward-compatible and/or changes current functionality).

Changes in:

• GCP
• Azure
• AWS
• IBM

Dev Checklist:

• Added Unit Tests, wherever applicable.
• Updated the Readme, if applicable.
• Existing Tests pass
• Verified functionality locally
• Self Reviewed my code for formatting and complex business logic.