[Synapse] - Add endpoint for US Government (#232)

Co-authored-by: Dongwei Wang <dongwwa@microsoft.com>

Author: idear1203

src/Authentication.Abstractions/AzureEnvironment.cs

@@ -268,6 +268,8 @@ private static void SetExtendedProperties(IDictionary<string, AzureEnvironment>
                 azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.OperationalInsightsEndpointResourceId, AzureEnvironmentConstants.USGovernmentOperationalInsightsEndpointResourceId);
                 azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.AnalysisServicesEndpointSuffix, AzureEnvironmentConstants.USGovernmentAnalysisServicesEndpointSuffix);
                 azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.AnalysisServicesEndpointResourceId, AzureEnvironmentConstants.USGovernmentAnalysisServicesEndpointResourceId);
+                azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.AzureSynapseAnalyticsEndpointSuffix, AzureEnvironmentConstants.USGovernmentSynapseAnalyticsEndpointSuffix);
+                azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.AzureSynapseAnalyticsEndpointResourceId, AzureEnvironmentConstants.USGovernmentSynapseAnalyticsEndpointResourceId);
                 azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.ManagedHsmServiceEndpointResourceId, AzureEnvironmentConstants.USGovernmeneManagedHsmServiceEndpointResourceId);
                 azureEnvironments[EnvironmentName.AzureUSGovernment].SetProperty(ExtendedEndpoint.ManagedHsmServiceEndpointSuffix, AzureEnvironmentConstants.USGovernmentManagedHsmDnsSuffix);
             }

src/Authentication.Abstractions/AzureEnvironmentConstants.cs

@@ -203,18 +203,20 @@ public static class AzureEnvironmentConstants
         /// </summary>
         public const string AzureSynapseAnalyticsEndpointSuffix = "dev.azuresynapse.net";
         public const string ChinaSynapseAnalyticsEndpointSuffix = "dev.azuresynapse.azure.cn";
+        public const string USGovernmentSynapseAnalyticsEndpointSuffix = "dev.azuresynapse.usgovcloudapi.net";
+
+        /// <summary>
+        /// The token audience for authorizing Synapse Service requests
+        /// </summary>
+        public const string AzureSynapseAnalyticsEndpointResourceId = "https://dev.azuresynapse.net";
+        public const string ChinaSynapseAnalyticsEndpointResourceId = "https://dev.azuresynapse.azure.cn";
+        public const string USGovernmentSynapseAnalyticsEndpointResourceId = "https://dev.azuresynapse.usgovcloudapi.net";
 
         /// <summary>
         /// The domain name suffix for Azure Container Registry
         /// </summary>
         public const string AzureContainerRegistryEndpointSuffix = "azurecr.io";
         public const string ChinaContainerRegistryEndpointSuffix = "azurecr.cn";
         public const string USGovernmentContainerRegistryEndpointSuffix = "azurecr.us";
-
-        /// <summary>
-        /// The token audience for authorizing Synapse Service requests
-        /// </summary>
-        public const string AzureSynapseAnalyticsEndpointResourceId = "https://dev.azuresynapse.net";
-        public const string ChinaSynapseAnalyticsEndpointResourceId = "https://dev.azuresynapse.net";
     }
 }