remove observedGeneration from postgresDatabase

[DmytroPI-dev]

Description

This PR aligns PostgresDatabase with the watch-driven reconciliation approach used for PostgresCluster. It removes the reconcile skip based on ObservedGeneration, reacts to owned Secret/ConfigMap drift even when the spec is unchanged, repairs configmap drift declaratively, and degrades status instead of recreating previously provisioned managed secrets that were deleted.

Key Changes

• postgresdatabase_controller.go add explicit drift-trigger predicates for owned Secret, ConfigMap, and relevant CNPG Database changes. Conflict retries are requeued without surfacing noisy reconcile errors.
• database.go remove the ObservedGeneration short-circuit and revalidated stages on every reconcile. Add drift handling for managed user secrets, configmap repair/re-adoption, retained-resource adoption, conflict-friendly database reconcile handling, and quieter ready/not-found paths.
• events.go Add events for drift and retained-resource adoption.
• cluster.go reduced log noise on transient status-update conflicts.

Testing and Verification

• Update controller tests in postgresdatabase_controller_test.go for:
  • configmap drift repair
  • deleted configmap recreation
  • deleted managed secret degradation without recreation
  • secret ownership re-adoption
  • adding a new database to an already provisioned resource
  • secondary-resource watch predicates
  • cluster-missing and role-conflict regressions
• Add unit tests in database_unit_test.go for secret/configmap drift and adoption paths.
• Verified behavior from controller logs/events during delete/recreate flows with both Delete and Retain policies.
• Automated tests were updated. All tests passed

Related Issues

CPI-1950

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.