chore(e2e,playwright): update config to only run .spec.ts files (#51985)

e2e/playwright.config.ts

@@ -13,6 +13,7 @@ dotenvConfig({ path: envPath });
  */
 export default defineConfig({
   testDir: './',
+  testMatch: '*.spec.ts',
   /* Run tests in files in parallel */
   fullyParallel: false,
   /* Fail the build on CI if you accidentally left test.only in the source code. */