feat: new AddonsConfig field stateful_ha_config

feat: new message StatefulHAConfig
docs: Autopilot.conversion_status is now OUTPUT_ONLY
docs: update Autopilot.conversion_status comment with behavior

PiperOrigin-RevId: 603382984

google/container/v1beta1/cluster_service.proto

@@ -1368,6 +1368,10 @@ message AddonsConfig {
 
   // Configuration for the Cloud Storage Fuse CSI driver.
   GcsFuseCsiDriverConfig gcs_fuse_csi_driver_config = 17;
+
+  // Optional. Configuration for the StatefulHA add-on.
+  StatefulHAConfig stateful_ha_config = 18
+      [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Configuration options for the HTTP (L7) load balancing controller addon,
@@ -1421,6 +1425,12 @@ message GkeBackupAgentConfig {
   bool enabled = 1;
 }
 
+// Configuration for the Stateful HA add-on.
+message StatefulHAConfig {
+  // Whether the Stateful HA add-on is enabled for this cluster.
+  bool enabled = 1;
+}
+
 // Configuration options for the Config Connector add-on.
 message ConfigConnectorConfig {
   // Whether Cloud Connector is enabled for this cluster.
@@ -5518,8 +5528,9 @@ message Autopilot {
   // Workload policy configuration for Autopilot.
   WorkloadPolicyConfig workload_policy_config = 2;
 
-  // ConversionStatus shows conversion status.
-  AutopilotConversionStatus conversion_status = 3;
+  // Output only. ConversionStatus shows conversion status.
+  AutopilotConversionStatus conversion_status = 3
+      [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // WorkloadPolicyConfig is the configuration of workload policy for autopilot