Gcp support http target cloud tasks (GONRG-1041)

Type of change

• Feature

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?

When cloud task hit indexer service, to authenticate it, indexer verify that it have only specified in core-lib-gcp headers

What is the new/expected behavior?

When cloud task hit indexer service, to authenticate it, indexer verify that it have specified in core-lib-gcp headers, and if this task not AppEngine task , token provided with task also must be verified.

Have you added/updated Unit Tests and Integration Tests?

• [YES]

Any other useful information

depends on: !50 (merged)

osdu/platform/system/lib/cloud/gcp/os-core-lib-gcp!6 (merged)

have changes from: !51 (merged)