[8.15](backport #40359) x-pack/filebeat/input/entityanalytics/provider/internal/okta: relax profile shape

[mergify]

Proposed commit message

The deserialisation of profile data was into a struct, preventing custom profile fields from being collected. So replace these types with a generic container.

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.

Disruptive User Impact

Author's Checklist

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How to test this PR locally

Related issues

• For [entityanalytics_okta]: Support retention of custom user profile attributes  integrations#10566

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---

This is an automatic backport of pull request #40359 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 99c1138 has failed:

On branch mergify/bp/8.15/pr-40359
Your branch is up to date with 'origin/8.15'.

You are currently cherry-picking commit 99c11386c3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   x-pack/filebeat/input/entityanalytics/provider/okta/internal/okta/okta.go
	modified:   x-pack/filebeat/input/entityanalytics/provider/okta/statestore_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/filebeat/input/entityanalytics/provider/okta/internal/okta/okta_test.go

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

[botelastic]

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