management: confirm server-side filtering 404s

[yaauie]

Release notes

• fixes an issue with Central Management where a spurious 404 when looking up pipeline definitions could cause the running pipelines to shut down.

What does this PR do?

When Central Management is looking up the instance's assigned pipelines, it now confirms a 404 is in fact an empty assignment, differentiating it from a 404 emitted for other reasons.

Why is it important/What is the impact to the user?

An ES node leaving the cluster can emit a 404, indicating that it cannot satisfy the request, which is different than an indication that the list of pipelines is empty.

This fix prevents such a 404 from shutting down the running pipelines.

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 (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

How to test this PR locally

Related issues

• Closes Unexpected pipeline shutdown with central-managed configurations #17980
• Closes Fix denial of service caused by a 404 from elasticsearch to managed logstashes #18078
• Relates CPM handle 404 response gracefully with user-friendly log #17052

[github-actions]

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[mergify]

This pull request does not have a backport label. Could you fix it @yaauie? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[elasticmachine]

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