[metricbeat/kubernetes] Remove fallback to the Node's limit for the pod 'usage.limit.pct' metrics

[tetianakravchenko]

Proposed commit message

• WHAT: Remove fallback to the Node's limit for the pod 'usage.limit.pct' metrics: kubernetes.pod.cpu.usage.limit.pct and kubernetes.pod.memory.usage.limit.pct If any container of the Pod does not have cpu limit defined: kubernetes.pod.cpu.usage.limit.pct will not be reported, similar for the memory: kubernetes.pod.memory.usage.limit.pct and memory.working_set.limit.pct will not be reported This implementation is similar to https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/v0.103.0/receiver/kubeletstatsreceiver/internal/kubelet/metadata.go#L113-L116
• WHY:

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.

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• [ ]

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @tetianakravchenko? 🙏. 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

[MichaelKatsoulis]

The fields definition must be updated as well in https://github.com/elastic/beats/blob/c2b2983c1825dcf7dabf64c4a04ce9cf34814fce/metricbeat/module/kubernetes/pod/_meta/fields.yml#L59. And also make update needs to be run to update the docs.