Change ConnectionMode to Gateway in CosmosDbScalerProvider (#910)

* Change ConnectionMode to Gateway in CosmosDbScalerProvider

* Update version

build/common.props

@@ -3,7 +3,7 @@
     <!-- Extensions can have independent versions and only increment when released -->
     <Version>3.0.0$(VersionSuffix)</Version>
     <ExtensionsVersion>5.1.0$(VersionSuffix)</ExtensionsVersion> <!-- WebJobs.Extensions -->
-    <CosmosDBVersion>4.8.1$(VersionSuffix)</CosmosDBVersion>
+    <CosmosDBVersion>4.8.2$(VersionSuffix)</CosmosDBVersion>
     <HttpVersion>3.2.0$(VersionSuffix)</HttpVersion>
     <MobileAppsVersion>3.0.0$(VersionSuffix)</MobileAppsVersion>
     <SendGridVersion>3.0.3$(VersionSuffix)</SendGridVersion>

src/WebJobs.Extensions.CosmosDB/Trigger/CosmosDbScalerProvider.cs

@@ -36,9 +36,11 @@ namespace Microsoft.Azure.WebJobs.Extensions.CosmosDB.Trigger
             ILoggerFactory loggerFactory = serviceProvider.GetService<ILoggerFactory>();
             CosmosDbMetadata cosmosDbMetadata = JsonConvert.DeserializeObject<CosmosDbMetadata>(triggerMetadata.Metadata.ToString());
             cosmosDbMetadata.ResolveProperties(serviceProvider.GetService<INameResolver>());
-            IOptions<CosmosClientOptions> options = serviceProvider.GetService<IOptions<CosmosClientOptions>>();
             ICosmosDBServiceFactory serviceFactory = new DefaultCosmosDBServiceFactory(config, azureComponentFactory);
-            CosmosClient cosmosClient = serviceFactory.CreateService(cosmosDbMetadata.Connection, options.Value);
+            CosmosClient cosmosClient = serviceFactory.CreateService(cosmosDbMetadata.Connection, new CosmosClientOptions
+            {
+                ConnectionMode = ConnectionMode.Gateway
+            });
             var monitoredContainer = cosmosClient.GetContainer(cosmosDbMetadata.DatabaseName, cosmosDbMetadata.ContainerName);
             var leaseContainer = cosmosClient.GetContainer(string.IsNullOrEmpty(cosmosDbMetadata.LeaseDatabaseName) ? cosmosDbMetadata.DatabaseName : cosmosDbMetadata.LeaseDatabaseName, string.IsNullOrEmpty(cosmosDbMetadata.LeaseContainerName) ? CosmosDBTriggerConstants.DefaultLeaseCollectionName : cosmosDbMetadata.LeaseContainerName);
             _scaleMonitor = new CosmosDBScaleMonitor(triggerMetadata.FunctionName, loggerFactory.CreateLogger<CosmosDBScaleMonitor>(), monitoredContainer, leaseContainer, cosmosDbMetadata.LeaseContainerPrefix);