Wire in MetricsReporter to FrontendServlet

This work is identical to the work done for BackendServlet in
[]

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132100448

javatests/google/registry/module/frontend/BUILD

@@ -20,6 +20,7 @@ java_library(
         "//third_party/java/servlet/servlet_api",
         "//third_party/java/truth",
         "//java/google/registry/module/frontend",
+        "//javatests/google/registry/testing",
     ],
 )