Normalize expected exception handling in tests

This removes exception rules that aren't used and switches over
existing uses of ExceptedException to ExceptionRule when possible.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=129013329

javatests/google/registry/ui/forms/BUILD

@@ -21,6 +21,7 @@ java_library(
         "//third_party/java/re2j",
         "//third_party/java/truth",
         "//java/google/registry/ui/forms",
+        "//javatests/google/registry/testing",
     ],
 )