reduce playwright worker on CI(4 to 2)

Author: dididy

zeppelin-web-angular/playwright.config.js

@@ -20,7 +20,7 @@ module.exports = defineConfig({
   fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
-  workers: 4,
+  workers: process.env.CI ? 2 : 4,
   timeout: 120000,
   expect: {
     timeout: 60000