app center；增加發送ping的秒

Assets/AppCenter/Plugins/AppCenterSDK/Distribute/Shared/UpdateAction.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+namespace Microsoft.AppCenter.Unity.Distribute
+{
+    /// <summary>
+    /// User update action.
+    /// </summary>
+    public enum UpdateAction
+    {
+        /// <summary>
+        /// Action to trigger the download of the release.
+        /// </summary>
+        Update,
+
+        /// <summary>
+        /// Action to postpone optional updates for 1 day.
+        /// </summary>
+        Postpone
+    }
+}