Use port names in Helm chart

[sebastien-prudhomme]

⚠️ Note on feature completeness ⚠️

We are narrowing the scope of acceptable enhancements to DefectDojo in preparation for v3. Learn more here:
https://github.com/DefectDojo/django-DefectDojo/blob/master/readme-docs/CONTRIBUTING.md

Description

Fix the way ports are referenced in the Helm chart by using port names.
Fix also the port name of the uWSGI container which was the same as the NGINX container.
Add a port for NGINX exporter in Service to allow ServiceMonitor, same idea as this closed PR #8240

Test results

Ideally you extend the test suite in tests/ and dojo/unittests to cover the changed in this PR.
Alternatively, describe what you have and haven't tested.

Documentation

Please update any documentation when needed in the documentation folder)

Checklist

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• Your code is python 3.11 compliant.
• If this is a new feature and not a bug fix, you've included the proper documentation in the docs at https://github.com/DefectDojo/django-DefectDojo/tree/dev/docs as part of this PR.
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Contributors: Git Tips

Rebase on dev branch

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On your working branch mybranch:

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Squashing commits

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[dsever]

Looks good

[mtesauro]

Approved