Add memory.workingset.limit.pct field in container and pod data stream

[MichaelKatsoulis]

What does this PR do?

This PR adds memory.working_set.limit.pct field in kubernetes pod data stream and memory.workingset.limit.pct in kubernetes container data stream following the addition of those fields in the k8s module metrcisets by #29547

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

Bring up elastic stack version 8.1.0-SNAPSHOT and enable kubernetes integration.
The new fields with the correct types are added in the metrics-kubernetes.pod and metrics-kubernetes.container index templates.

Related issues

• Closes Add memory.workingset.limit.pct and memory.working_set.limit.pct` fields in pod and container kubernetes integration #2374

Screenshots

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Build stats

• Start Time: 2022-01-10T08:58:04.088+0000

• Duration: 30 min 58 sec

• Commit: 2c918e3

Test stats 🧪

Test	Results
Failed	0
Passed	116
Skipped	0
Total	116

🤖 GitHub comments

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[tetianakravchenko]

should here be added unit as well as metric_type? according to https://github.com/elastic/observability-dev/blob/main/docs/dc/integrations/development/generic_guidelines.md#document-all-fields

[MichaelKatsoulis]

You are right. Added in f0e4319

[tetianakravchenko]

@MichaelKatsoulis should also sample_event.json files get updated to include new fields?

[MichaelKatsoulis]

Yes It should! 2c918e3

[tetianakravchenko]

the same here