Weekend migration from dropping an empty index
What does this MR do and why?
This migration drops a temporary index that we're not using anymore. The schema change was introduced in !79547 (merged), after the index was originally built asynchronously over the weekend.
A background migration ran to clear all the timestamps from the targeted trace artifacts, and we've since verified that there are none left:
This index should be empty, which we can be checked as part of the database review.
Closes #352772 (closed)
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