[8.7](backport #34621) x-pack/filebeat/module/okta: fill okta.request.ip_chain.* as a flattened object

[mergify]

This is an automatic backport of pull request #34621 done by Mergify.
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On branch mergify/bp/8.7/pr-34621
Your branch is up to date with 'origin/8.7'.

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Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   filebeat/docs/fields.asciidoc
	modified:   x-pack/filebeat/module/okta/system/_meta/fields.yml
	modified:   x-pack/filebeat/module/okta/system/ingest/pipeline.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/filebeat/module/okta/fields.go
	both modified:   x-pack/filebeat/module/okta/system/test/okta-system-test.json.log-expected.json

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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• Start Time: 2023-02-23T20:37:13.172+0000

• Duration: 73 min 30 sec

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Test	Results
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Total	8301

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