Skip failing/flaky nginx stubstatus integration test

[belimawr]

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

[botelastic]

This pull request doesn't have a Team:<team> label.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @belimawr? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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Build stats

• Duration: 51 min 52 sec

❕ Flaky test report

No test was executed to be analysed.

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