GCP Flexible ENV VARS (INTEGRATION_TESTER, NO_DATA_ACCESS_TESTER) ingestion logic (GONRG-751)

Description:

• New utility class org.opengroup.osdu.gcp.workflow.util.DecodedContentExtractor in the workflow-test-gcp module;
• GoogleServiceAccount class, when treat ENV VARS INTEGRATION_TESTER and NO_DATA_ACCESS_TESTER, uses DecodedContentExtractor to analyze and properly interpret their values (content or filename; plain or base64 encoded);
• Variables treatment process extended logging;

Closes EPAM GONRG-751 "Pass secrets into Ingestion Services as base64 encoded string" for Ingestion Workflow

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.

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