[infra] Run chromium tests (incl layout) when modifying error messages

This makes it less likely to break layout tests (and block rolling V8 to
Chromium) by accident.

BUG=v8:8595
NOTRY=true

Change-Id: Ie5d2fad72b5b6dc4e3101114068ad134add2e475
Reviewed-on: https://chromium-review.googlesource.com/c/1379882
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58305}

infra/config/cq.cfg

@@ -125,6 +125,7 @@ verifiers {
         name: "linux_chromium_rel_ng"
         path_regexp: "include/.+\\.h"
         path_regexp: "src/api\\.cc"
+        path_regexp: "src/message-template\\.h"
       }
       builders {
         name: "linux_chromium_headless_rel"