Support for multiple destinations for GitHubVulnerabilities2v3 job (#10741)

* Configuration update.
* BlobStorageVulnerabilityWriter with secondary storage.

Author: agr

src/GitHubVulnerabilities2v3/Configuration/DestinationConfiguration.cs

@@ -0,0 +1,18 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+namespace GitHubVulnerabilities2v3.Configuration
+{
+    public class DestinationConfiguration
+    {
+        /// <summary>
+        /// The storage connection to use to save the job's output.
+        /// </summary>
+        public string StorageConnectionString { get; set; }
+
+        /// <summary>
+        /// Base URL to use for absolute URLs of child documents.
+        /// </summary>
+        public string V3BaseUrl { get; set; }
+    }
+}

src/GitHubVulnerabilities2v3/Configuration/GitHubVulnerabilities2v3Configuration.cs

@@ -1,27 +1,20 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Collections.Generic;
 using NuGet.Services.GitHub.Configuration;
 
 namespace GitHubVulnerabilities2v3.Configuration
 {
     public class GitHubVulnerabilities2v3Configuration : GraphQLQueryConfiguration
     {
-        /// <summary>
-        /// The storage connection to use to save the job's output.
-        /// </summary>
-        public string StorageConnectionString { get; set; }
+        public IReadOnlyList<DestinationConfiguration> Destinations { get; set; }
 
         /// <summary>
         /// The storage container to save the job's output in.
         /// </summary>
         public string V3VulnerabilityContainerName { get; set; } = "v3-vulnerabilities";
 
-        /// <summary>
-        /// Service Index Root
-        /// </summary>
-        public string V3BaseUrl { get; set; } = "https://api.nuget.org/";
-
         /// <summary>
         /// The name of the blob to save the job's advisories cursor in.
         /// </summary>