Revert "Shorten the defeult timeout of individual call to backend (#620)"

This reverts commit 87f0f85.

Author: amerjusupovic

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/AzureAppConfigurationOptions.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT license.
 //
 using Azure.Core;
-using Azure.Core.Pipeline;
 using Azure.Data.AppConfiguration;
 using Microsoft.Extensions.Configuration.AzureAppConfiguration.AzureKeyVault;
 using Microsoft.Extensions.Configuration.AzureAppConfiguration.Extensions;
@@ -11,7 +10,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Net.Http;
 using System.Threading.Tasks;
 
 namespace Microsoft.Extensions.Configuration.AzureAppConfiguration
@@ -24,7 +22,6 @@ public class AzureAppConfigurationOptions
     {
         private const int MaxRetries = 2;
         private static readonly TimeSpan MaxRetryDelay = TimeSpan.FromMinutes(1);
-        private static readonly TimeSpan NetworkTimeout = TimeSpan.FromSeconds(10);
         private static readonly KeyValueSelector DefaultQuery = new KeyValueSelector { KeyFilter = KeyFilter.Any, LabelFilter = LabelFilter.Null };
 
         private List<KeyValueWatcher> _individualKvWatchers = new List<KeyValueWatcher>();
@@ -513,10 +510,6 @@ private static ConfigurationClientOptions GetDefaultClientOptions()
             clientOptions.Retry.MaxDelay = MaxRetryDelay;
             clientOptions.Retry.Mode = RetryMode.Exponential;
             clientOptions.AddPolicy(new UserAgentHeaderPolicy(), HttpPipelinePosition.PerCall);
-            clientOptions.Transport = new HttpClientTransport(new HttpClient()
-            {
-                Timeout = NetworkTimeout
-            });
 
             return clientOptions;
         }

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/AzureAppConfigurationProvider.cs

@@ -1221,13 +1221,6 @@ await ExecuteWithFailOverPolicyAsync<object>(clients, async (client) =>
 
         private bool IsFailOverable(AggregateException ex)
         {
-            TaskCanceledException tce = ex.InnerExceptions?.LastOrDefault(e => e is TaskCanceledException) as TaskCanceledException;
-
-            if (tce != null && tce.InnerException is TimeoutException)
-            {
-                return true;
-            }
-
             RequestFailedException rfe = ex.InnerExceptions?.LastOrDefault(e => e is RequestFailedException) as RequestFailedException;
 
             return rfe != null ? IsFailOverable(rfe) : false;