fix(psql): preserve false durability status

[HaoyL666]

solve: https://jira.oci.oraclecorp.com/browse/OKE-44456

Summary

Preserves PostgreSQL status.storageDetails.isRegionallyDurable: false instead of omitting it during status serialization.

Changes

• Generate required observed-state boolean fields as pointers where false must remain explicitly represented.
• Update PostgreSQL DbSystem status to use *bool without omitempty.
• Add regression coverage for status patch persistence with false.
• Refresh PostgreSQL generated API, CRD/package artifacts, and generated documentation.

Validation

• Focused PostgreSQL and generator tests
• envtest status persistence test
• go build ./...
• go vet ./...
• Live OKE/OCI reconciliation: confirmed OCI durability false is persisted in the CR status