Reintroduce index for Feedback migration
What does this MR do and why?
In Add supporting index for Feedback migration (!103347 - merged) we created an index to support Vulnerabilities::Feedback records background migration (!97699 (merged)). Thanks to Adam we realized the index will not be used and we need a different one.
This MR removes the "invalid" one and introduces a proper index to support the background migration
Related to #324893 (closed)
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