vng shutdown hours support

api/services/ocean/gke/schemas/ocean-launch-spec-scheduling.yaml

@@ -1,8 +1,29 @@
 type: object
 description: >
-  An object used to define scheduled tasks such as a manual headroom update.
+  An object used to define scheduled tasks such as a manual headroom update or a VNG-level shutdown window.
 title: Ocean Scheduling
 properties:
+  shutdownHours:
+    type: object
+    description: >
+      An object used to specify times that the nodes in the virtual node group will be taken down.
+    properties:
+      isEnabled:
+        type: boolean
+        description: >
+          Flag to enable or disable the shutdown hours mechanism. When False, the mechanism is
+          deactivated, and the virtual node group remains in its current state.
+        example: true
+      timeWindows:
+        type: array
+        required: true
+        description: >
+          The times that the shutdown hours will apply.
+        items:
+          type: string
+        example:
+          - "Mon:00:30-Mon:23:00"
+          - "Tue:06:30-Tue:23:00"
   tasks:
     type: array
     items: