[8.13](backport #38648) Skip failing/flaky nginx stubstatus integration test

[mergify]

Proposed commit message

The integration test is failing and blocking CI, hence we're skipping it for now. More details on
#38569.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

## Author's Checklist
## How to test this PR locally

Related issues

• Relates: Build 1067 for 7.17 with status FAILURE - TestFetch – github.com/elastic/beats/v7/metricbeat/module/nginx/stubstatus #38569

## Use cases
## Screenshots
## Logs

---

This is an automatic backport of pull request #38648 done by [Mergify](https://mergify.com).

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[elasticmachine]

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• Duration: 52 min 36 sec

❕ Flaky test report

No test was executed to be analysed.

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