Add simple registry-lock-verification page (#2499)

This is a fairly simple page that solely exists to display the result
from the action, and to link the user back to the domain list.

core/src/main/java/google/registry/tools/DomainLockUtils.java

@@ -343,7 +343,7 @@ public final class DomainLockUtils {
         .orElseThrow(
             () ->
                 new IllegalArgumentException(
-                    String.format("Invalid verification code %s", verificationCode)));
+                    String.format("Invalid verification code \"%s\"", verificationCode)));
   }
 
   private void applyLockStatuses(RegistryLock lock, DateTime lockTime, boolean isAdmin) {

core/src/main/java/google/registry/ui/server/console/ConsoleApiAction.java

@@ -161,7 +161,7 @@ public abstract class ConsoleApiAction implements Runnable {
 
     Map<String, Object> registrarDiffMap = registrar.toDiffableFieldMap();
     Stream.of("passwordHash", "salt") // fields to remove from final diff
-        .forEach(fieldToBeRemoved -> registrarDiffMap.remove(fieldToBeRemoved));
+        .forEach(registrarDiffMap::remove);
 
     // Use LinkedHashMap here to preserve ordering; null values mean we can't use ImmutableMap.
     LinkedHashMap<String, Object> result = new LinkedHashMap<>(registrarDiffMap);

core/src/test/java/google/registry/ui/server/console/ConsoleRegistryLockVerifyActionTest.java

@@ -156,7 +156,7 @@ public class ConsoleRegistryLockVerifyActionTest {
     action.run();
     assertThat(response.getStatus()).isEqualTo(HttpServletResponse.SC_BAD_REQUEST);
     assertThat(response.getPayload())
-        .isEqualTo("Invalid verification code 123456789ABCDEFGHJKLMNPQRSTUUUUU");
+        .isEqualTo("Invalid verification code \"123456789ABCDEFGHJKLMNPQRSTUUUUU\"");
     assertThat(loadByEntity(defaultDomain).getStatusValues()).containsExactly(StatusValue.INACTIVE);
   }