adding finalizer option in all manifests and rework its docs (#2521)

manifests/configmap.yaml

@@ -39,6 +39,7 @@ data:
   # enable_admin_role_for_users: "true"
   # enable_crd_registration: "true"
   # enable_cross_namespace_secret: "false"
+  enable_finalizers: "false"
   # enable_database_access: "true"
   enable_ebs_gp3_migration: "false"
   # enable_ebs_gp3_migration_max_size: "1000"

manifests/operatorconfiguration.crd.yaml

@@ -203,6 +203,9 @@ spec:
                   enable_cross_namespace_secret:
                     type: boolean
                     default: false
+                  enable_finalizers:
+                    type: boolean
+                    default: false
                   enable_init_containers:
                     type: boolean
                     default: true

manifests/postgresql-operator-default-configuration.yaml

@@ -57,6 +57,7 @@ configuration:
     # - deployment-time
     # - downscaler/*
     # enable_cross_namespace_secret: "false"
+    enable_finalizers: false
     enable_init_containers: true
     enable_pod_antiaffinity: false
     enable_pod_disruption_budget: true