unskip saved search dashboard journey (#148987)

## Summary

This test was skipped due to the following error:

```
Executable doesn't exist at /var/lib/buildkite-agent/.cache/ms-playwright/chromium-1028/chrome-linux/chrome
```

It is hard to say why chrome binary was missing on a worker, but test is
not a reason: I checked the reported failures and other journeys were
failing as well. If it happens again, we need to investigate how chrome
is cached, playwright dependency was updated or some other race
condition.

x-pack/performance/journeys/ecommerce_dashboard_saved_search_only.ts

@@ -10,8 +10,6 @@ import { subj } from '@kbn/test-subj-selector';
 import { waitForVisualizations } from '../utils';
 
 export const journey = new Journey({
-  // FAILING: https://github.com/elastic/kibana/issues/148221
-  skipped: true,
   esArchives: ['x-pack/performance/es_archives/sample_data_ecommerce'],
   kbnArchives: ['x-pack/performance/kbn_archives/ecommerce_saved_search_only_dashboard'],
 })