Add index bulk imports on status

Carla Dragorequested to merge
533657-add-index-on-status into master

What does this MR do and why?

This adds an index to the bulk_imports table to optimize operations scoped to status.

It is required to run this background migration: Clean up old bulk import configs (!203551 - merged)

References

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Related to #533657

Edited by Carla Drago

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