fix array validation for global maintenance window and protected role names (#3120)

* change type of maintenance windows in config crd
* fix default array type for protected role names

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -706,6 +706,10 @@ spec:
                     type: integer
                 type: object
               maintenance_windows:
+                items:
+                  pattern: ^\ *((Mon|Tue|Wed|Thu|Fri|Sat|Sun):(2[0-3]|[01]?\d):([0-5]?\d)|(2[0-3]|[01]?\d):([0-5]?\d))-((2[0-3]|[01]?\d):([0-5]?\d)|(2[0-3]|[01]?\d):([0-5]?\d))\
+                    *$
+                  type: string
                 type: array
               major_version_upgrade:
                 description: MajorVersionUpgradeConfiguration defines how to execute
@@ -851,7 +855,9 @@ spec:
                       type: string
                     type: array
                   protected_role_names:
-                    default: '["admin", "cron_admin"]'
+                    default:
+                    - admin
+                    - cron_admin
                     items:
                       type: string
                     type: array