feat: Make INTERNAL a retryable error for Pull

PiperOrigin-RevId: 510255779

Source-Link: googleapis/googleapis@58e4422

Source-Link: googleapis/googleapis-gen@d67c1eb
Copy-Tag: eyJwIjoiYXBpcy9Hb29nbGUuQ2xvdWQuUHViU3ViLlYxLy5Pd2xCb3QueWFtbCIsImgiOiJkNjdjMWViOWYwNDVmMzQyYTFkYmFkNjY2NmFmM2MxMzMxZWFlNjE1In0=

apis/Google.Cloud.PubSub.V1/Google.Cloud.PubSub.V1/SubscriberServiceApiClient.g.cs

@@ -225,13 +225,14 @@ private SubscriberServiceApiSettings(SubscriberServiceApiSettings existing) : ba
         /// <item>
         /// <description>
         /// Retriable status codes: <see cref="grpccore::StatusCode.Unknown"/>,
-        /// <see cref="grpccore::StatusCode.Aborted"/>, <see cref="grpccore::StatusCode.Unavailable"/>.
+        /// <see cref="grpccore::StatusCode.Aborted"/>, <see cref="grpccore::StatusCode.Unavailable"/>,
+        /// <see cref="grpccore::StatusCode.Internal"/>.
         /// </description>
         /// </item>
         /// <item><description>Timeout: 60 seconds.</description></item>
         /// </list>
         /// </remarks>
-        public gaxgrpc::CallSettings PullSettings { get; set; } = gaxgrpc::CallSettingsExtensions.WithRetry(gaxgrpc::CallSettings.FromExpiration(gax::Expiration.FromTimeout(sys::TimeSpan.FromMilliseconds(60000))), gaxgrpc::RetrySettings.FromExponentialBackoff(maxAttempts: 5, initialBackoff: sys::TimeSpan.FromMilliseconds(100), maxBackoff: sys::TimeSpan.FromMilliseconds(60000), backoffMultiplier: 1.3, retryFilter: gaxgrpc::RetrySettings.FilterForStatusCodes(grpccore::StatusCode.Unknown, grpccore::StatusCode.Aborted, grpccore::StatusCode.Unavailable)));
+        public gaxgrpc::CallSettings PullSettings { get; set; } = gaxgrpc::CallSettingsExtensions.WithRetry(gaxgrpc::CallSettings.FromExpiration(gax::Expiration.FromTimeout(sys::TimeSpan.FromMilliseconds(60000))), gaxgrpc::RetrySettings.FromExponentialBackoff(maxAttempts: 5, initialBackoff: sys::TimeSpan.FromMilliseconds(100), maxBackoff: sys::TimeSpan.FromMilliseconds(60000), backoffMultiplier: 1.3, retryFilter: gaxgrpc::RetrySettings.FilterForStatusCodes(grpccore::StatusCode.Unknown, grpccore::StatusCode.Aborted, grpccore::StatusCode.Unavailable, grpccore::StatusCode.Internal)));
 
         /// <summary>
         /// <see cref="gaxgrpc::CallSettings"/> for synchronous and asynchronous calls to