Add resource_label_events.namespace_id sync index

Mario Celirequested to merge
514594-add-sync-index into master

What does this MR do and why?

Adds resource_label_events.namespace_id index SYNC for all instances. The index was already created in .com over the weekend as it took more than 10mins to be created.

Index created async in !197395 (merged)

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 #514594 (closed)

Merge request reports