Migrate GithubVulnerabilities2V3 to MSI (#10239)

* Migrate GitHubVulnerabilities2V3 job to MSI for storage access

* Addressed feedback

Author: drewgillies

src/GitHubVulnerabilities2v3/Job.cs

@@ -7,6 +7,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Autofac;
+using Azure.Identity;
 using Azure.Storage.Blobs;
 using GitHubVulnerabilities2v3.Configuration;
 using GitHubVulnerabilities2v3.Extensions;
@@ -16,6 +17,7 @@
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using NuGet.Jobs;
+using NuGet.Services.Configuration;
 using NuGet.Services.Cursor;
 using NuGet.Services.GitHub.Collector;
 using NuGet.Services.GitHub.Configuration;
@@ -68,7 +70,7 @@ protected override void ConfigureAutofacServices(ContainerBuilder containerBuild
 
             ConfigureQueryServices(containerBuilder);
             ConfigureIngestionServices(containerBuilder);
-            ConfigureCollectorServices(containerBuilder);
+            ConfigureCollectorServices(containerBuilder, configurationRoot);
         }
 
         protected void ConfigureIngestionServices(ContainerBuilder containerBuilder)
@@ -111,14 +113,14 @@ protected void ConfigureQueryServices(ContainerBuilder containerBuilder)
                 .As<IAdvisoryQueryService>();
         }
 
-        protected void ConfigureCollectorServices(ContainerBuilder containerBuilder)
+        protected void ConfigureCollectorServices(ContainerBuilder containerBuilder, IConfigurationRoot configurationRoot)
         {
             containerBuilder
                 .Register(ctx =>
                 {
                     var config = ctx.Resolve<GitHubVulnerabilities2v3Configuration>();
-                    var connectionString = AzureStorageFactory.PrepareConnectionString(config.StorageConnectionString);
-                    return new BlobServiceClient(connectionString);
+                    var credential = new ManagedIdentityCredential(configurationRoot[Constants.ManagedIdentityClientIdKey]);
+                    return new BlobServiceClient(new Uri(config.StorageConnectionString), credential);
                 })
                 .As<BlobServiceClient>();