feat(networkservices): update the API

#### networkservices:v1beta1

The following keys were added:
- schemas.ServiceLbPolicy.properties.isolationConfig.$ref
- schemas.ServiceLbPolicy.properties.isolationConfig.description
- schemas.ServiceLbPolicyIsolationConfig.description
- schemas.ServiceLbPolicyIsolationConfig.id
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationGranularity.description
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationGranularity.enum
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationGranularity.enumDescriptions
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationGranularity.type
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationMode.description
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationMode.enum
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationMode.enumDescriptions
- schemas.ServiceLbPolicyIsolationConfig.properties.isolationMode.type
- schemas.ServiceLbPolicyIsolationConfig.type

The following keys were changed:
- schemas.ExtensionChainExtension.properties.timeout.description

Author: yoshi-automation

discovery/networkservices-v1beta1.json

@@ -2879,7 +2879,7 @@
       }
     }
   },
-  "revision": "20250410",
+  "revision": "20250423",
   "rootUrl": "https://networkservices.googleapis.com/",
   "schemas": {
     "AuthzExtension": {
@@ -3180,7 +3180,7 @@
           "type": "array"
         },
         "timeout": {
-          "description": "Optional. Specifies the timeout for each individual message on the stream. The timeout must be between `10`-`1000` milliseconds. Required for callout extensions. This field is not supported for plugin extensions. Setting it results in a validation error.",
+          "description": "Optional. Specifies the timeout for each individual message on the stream. The timeout must be between `10`-`10000` milliseconds. Required for callout extensions. This field is not supported for plugin extensions. Setting it results in a validation error.",
           "format": "google-duration",
           "type": "string"
         }
@@ -5245,6 +5245,10 @@
           "$ref": "ServiceLbPolicyFailoverConfig",
           "description": "Optional. Configuration related to health based failover."
         },
+        "isolationConfig": {
+          "$ref": "ServiceLbPolicyIsolationConfig",
+          "description": "Optional. Configuration to provide isolation support for the associated Backend Service."
+        },
         "labels": {
           "additionalProperties": {
             "type": "string"
@@ -5306,6 +5310,39 @@
       },
       "type": "object"
     },
+    "ServiceLbPolicyIsolationConfig": {
+      "description": "Configuration to provide isolation support for the associated Backend Service.",
+      "id": "ServiceLbPolicyIsolationConfig",
+      "properties": {
+        "isolationGranularity": {
+          "description": "Optional. The isolation granularity of the load balancer.",
+          "enum": [
+            "ISOLATION_GRANULARITY_UNSPECIFIED",
+            "REGION"
+          ],
+          "enumDescriptions": [
+            "No isolation is configured for the backend service. Traffic can overflow based on the load balancing algorithm.",
+            "Traffic for this service will be isolated at the cloud region level."
+          ],
+          "type": "string"
+        },
+        "isolationMode": {
+          "description": "Optional. The isolation mode of the load balancer.",
+          "enum": [
+            "ISOLATION_MODE_UNSPECIFIED",
+            "NEAREST",
+            "STRICT"
+          ],
+          "enumDescriptions": [
+            "No isolation mode is configured for the backend service.",
+            "Traffic will be sent to the nearest region.",
+            "Traffic will fail if no serving backends are available in the same region as the load balancer."
+          ],
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
     "Status": {
       "description": "The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors).",
       "id": "Status",

src/apis/networkservices/v1beta1.ts

@@ -309,7 +309,7 @@ export namespace networkservices_v1beta1 {
      */
     supportedEvents?: string[] | null;
     /**
-     * Optional. Specifies the timeout for each individual message on the stream. The timeout must be between `10`-`1000` milliseconds. Required for callout extensions. This field is not supported for plugin extensions. Setting it results in a validation error.
+     * Optional. Specifies the timeout for each individual message on the stream. The timeout must be between `10`-`10000` milliseconds. Required for callout extensions. This field is not supported for plugin extensions. Setting it results in a validation error.
      */
     timeout?: string | null;
   }
@@ -1740,6 +1740,10 @@ export namespace networkservices_v1beta1 {
      * Optional. Configuration related to health based failover.
      */
     failoverConfig?: Schema$ServiceLbPolicyFailoverConfig;
+    /**
+     * Optional. Configuration to provide isolation support for the associated Backend Service.
+     */
+    isolationConfig?: Schema$ServiceLbPolicyIsolationConfig;
     /**
      * Optional. Set of label tags associated with the ServiceLbPolicy resource.
      */
@@ -1775,6 +1779,19 @@ export namespace networkservices_v1beta1 {
      */
     failoverHealthThreshold?: number | null;
   }
+  /**
+   * Configuration to provide isolation support for the associated Backend Service.
+   */
+  export interface Schema$ServiceLbPolicyIsolationConfig {
+    /**
+     * Optional. The isolation granularity of the load balancer.
+     */
+    isolationGranularity?: string | null;
+    /**
+     * Optional. The isolation mode of the load balancer.
+     */
+    isolationMode?: string | null;
+  }
   /**
    * The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors).
    */