CLOUDP-345376: enable concurrent reconciliation

[s-urbaniak]

Summary

This enables concurrent reconciliation for our controllers.

Proof of Work

(Hopefully) green e2e tests.

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
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• Have you signed our CLA?

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[filipcirtog]

LGTM! Great addition. Hopefully the e2e tests will pass.

[josvazg]

@s-urbaniak now that release is merged, should we merge this and soak it in main instead?

[josvazg]

Should we try to merge and soak this in?