feat(catalog-backend-module-okta): export EntityTransformer types, including example factory usage

[robbat2]

Export types for OktaGroupEntityTransformer & OktaUserEntityTransformer, and show how they can be used to stack/modify other transformers.

✔️ Checklist

• Added tests for new functionality and regression tests for bug fixes - N/A, functional change is two exports only
• Added changeset (run yarn changeset in the root)
• Screenshots of before and after attached (for UI changes) - N/A
• Added or updated documentation (if applicable)

[Xantier]

Could you add a changeset into the PR

[robbat2]

woops, my bad, staged the file and missed in the actual commit.

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
        new file:   .changeset/20250115.md

[Xantier]

Nice! Thank you

[Xantier]

Few prettier errors to fix and this can be merged

[robbat2]

Few prettier errors to fix and this can be merged

Most of the prettier errors were pre-existing, but I fixed them anyway.

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[robbat2]

@Xantier prettier should be good now