Test purpose:
Validate the RHDH RBAC deployment on OSD/GCP.

Failure message:
`error: timed out waiting for the condition on jobs/rhdh-rbac-create-sonataflow-database`

Root Cause Analysis:
The `rbac_deployment_osd_gcp()` function in `.ibm/pipelines/utils.sh` doesn't wait for PostgreSQL to be ready before deploying the helm chart. The chart creates the `rhdh-rbac-create-sonataflow-database` job immediately, but PostgreSQL isn't ready yet, causing the job to timeout.

Suggested Fix:
Add a PostgreSQL readiness wait to `rbac_deployment_osd_gcp()` before the helm deployment, matching `rbac_deployment()`.