chore(editor): add retry for flaky test (#12143)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **Tests**
  - Updated integration test configuration to automatically retry failed tests up to 3 times in CI environments, improving test reliability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/integration-test/vitest.config.ts

@@ -15,6 +15,7 @@ export default defineConfig(_configEnv =>
     plugins: [vanillaExtractPlugin()],
     test: {
       include: ['src/__tests__/**/*.spec.ts'],
+      retry: process.env.CI === 'true' ? 3 : 0,
       browser: {
         enabled: true,
         headless: process.env.CI === 'true',