Add summary reporter at end of test running

This will make it easy to see all the failures that happened

https://imgur.com/a/4Vs0Lcg

Release-Notes: skip
Change-Id: Ie390671f26045a3f76e5710ac5ab4b6be1b538e6
diff --git a/polygerrit-ui/web-test-runner.config.mjs b/polygerrit-ui/web-test-runner.config.mjs
index 345b12c..44b5969 100644
--- a/polygerrit-ui/web-test-runner.config.mjs
+++ b/polygerrit-ui/web-test-runner.config.mjs
@@ -1,4 +1,5 @@
 import { esbuildPlugin } from "@web/dev-server-esbuild";
+import { defaultReporter, summaryReporter } from "@web/test-runner";
 
 /** @type {import('@web/test-runner').TestRunnerConfig} */
 const config = {
@@ -18,5 +19,6 @@
       tsconfig: "app/tsconfig.json",
     }),
   ],
+  reporters: [defaultReporter(), summaryReporter()],
 };
 export default config;