Final sharding key steps for resource_iteration_events

Mario Celirequested to merge
514595-final-sharding-key-steps into master

What does this MR do and why?

Validate sharding key FK after finalizing the backfill BBM

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #514595 (closed)

Merge request reports