Fix GCP integration tests (GONRG-2832)

Type of change

• Bug Fix
• Feature

Added implementation for new interfaces added in core module to fix broken tests

Does this introduce a change in the core logic?

• [NO]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a breaking change?

• [NO]

What is the current behavior?

After adding new interfaces, GCP tests were broken. In this MR, the interfaces were implemented and the tests should pass the pipeline.