[WIP] refactor(okta): datamodel migration

[jychp]

Summary

Describe your changes.

Related issues or links

Include links to relevant issues or other pages.

• https://github.com/cartography-cncf/cartography/issues/...

Checklist

Provide proof that this works (this makes reviews move faster). Please perform one or more of the following:

• [ ] Update/add unit or integration tests.
• [ ] Include a screenshot showing what the graph looked like before and after your changes.
• [ ] Include console log trace showing what happened before and after your changes.

If you are changing a node or relationship:

• [ ] Update the schema and readme.

If you are implementing a new intel module:

• [ ] Use the NodeSchema data model.

[achantavy]

@jychp by the way this one exists: https://github.com/cartography-cncf/cartography/pull/1243 -- maybe we can try to work off this one