[Backport 3.3] Publish internal modules separately for downstream reuse

[opensearch-trigger-bot]

Backport 05d6594 from #4484.

[Swiddis]

Failing because of missing dependency snapshots, need to hold this until they're ready

[opensearch-trigger-bot]

This PR is stalled because it has been open for 2 weeks with no activity.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backport/backport-4484-to-3.3

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[Swiddis]

Don't think we need this anymore since we've shipped 3.4, no real value in this being the latest released version