chore(electron): speed up electron tests (#9871)

tests/affine-desktop/playwright.config.ts

@@ -16,7 +16,6 @@ import type { PlaywrightTestConfig } from '@playwright/test';
 const config: PlaywrightTestConfig = {
   testDir: './e2e',
   fullyParallel: true,
-  workers: 1,
   timeout: process.env.CI ? 50_000 : 30_000,
   expect: {
     timeout: process.env.CI ? 15_000 : 5_000,
@@ -30,6 +29,7 @@ const config: PlaywrightTestConfig = {
 
 if (process.env.CI) {
   config.retries = 5;
+  config.workers = 2;
 }
 
 if (process.env.DEV_SERVER_URL) {