[Package Signing] Add Missing Dependency Injection (#333)

A `ICertificateVerifier` type wasn't registered for the Validate Certificate job, causing it to fail to initialize.

Author: loic-sharma

src/Validation.PackageSigning.ValidateCertificate/Job.cs

@@ -148,6 +148,7 @@ private void ConfigureJobServices(IServiceCollection services, IConfigurationRoo
                 return new CertificateStore(storage, LoggerFactory.CreateLogger<CertificateStore>());
             });
 
+            services.AddTransient<ICertificateVerifier, OnlineCertificateVerifier>();
             services.AddTransient<ICertificateValidationService, CertificateValidationService>();
             services.AddTransient<ITelemetryService, TelemetryService>();
         }