test(testing): fix o3r-testing unit tests (#3130)

## Proposed change

Unit tests broken by #3127
The PR passed due to an issue with `.nxignore` containing the template
files

## Related issues

<!--
Please make sure to follow the [contribution
guidelines](https://github.com/amadeus-digital/Otter/blob/main/CONTRIBUTING.md)
-->

*- No issue associated -*

<!-- * 🐛 Fix #issue -->
<!-- * 🐛 Fix resolves #issue -->
<!-- * 🚀 Feature #issue -->
<!-- * 🚀 Feature resolves #issue -->
<!-- *  Pull Request #issue -->

Author: fpaul-1A

packages/@o3r/testing/schematics/playwright/sanity/index.spec.ts

@@ -46,7 +46,7 @@ describe('Playwright Sanity', () => {
     });
 
     it('should have the default template', () => {
-      expect(tree.readContent('/e2e-playwright/sanity/test-playwright-sanity.e2e.ts')).toContain('test.describe.serial');
+      expect(tree.readContent('/e2e-playwright/sanity/test-playwright-sanity.e2e.ts')).toContain('test.describe');
       expect(tree.readContent('/e2e-playwright/sanity/test-playwright-sanity.e2e.ts')).toContain('test(');
     });
   });