chore: add Playwright browser configurations for Chromium and Firefox in web-test-runner setup

Author: alexpmule

web-test-runner.config.mjs

@@ -3,6 +3,16 @@ import { visualRegressionPlugin } from '@web/test-runner-visual-regression/plugi
 export default {
   files: 'test/**/*.test.js',
   nodeResolve: true,
+  browsers: [
+    playwrightLauncher({
+      product: 'chromium',
+      launchOptions: {
+        args: ['--no-sandbox', '--disable-setuid-sandbox'],
+        timeout: 20000
+      }
+    }),
+    playwrightLauncher({ product: 'firefox' }),
+  ],
   middleware: [
     function rewriteBase(context, next) {
       if (context.url.indexOf('/base') === 0) {