x-pack/filebeat/module/okta: add extended okta.debug_context.debug_data handling

[efd6]

What does this PR do?

This is the beats cognate for elastic/integrations#3362 which adds additional handling of the debug_context.debug_data object and particularly the risk level field that is in that object.

Why is it important?

This adds important fields for threat risk assessment.

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.

Author's Checklist

• Compare with integrations addition.

How to test this PR locally

Related issues

• Closes [Filebeat][Okta] Parse additonal debug data risk field for Okta module #30961
• Relates okta: add extended okta.debug_context.debug_data handling integrations#3362

Use cases

Screenshots

Logs

[elasticmachine]

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• Start Time: 2022-05-23T11:34:04.883+0000

• Duration: 77 min 43 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6242
Skipped	737
Total	6979

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[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b 30961-okta upstream/30961-okta
git merge upstream/main
git push upstream 30961-okta

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b 30961-okta upstream/30961-okta
git merge upstream/main
git push upstream 30961-okta

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)