Add tmp index on vulnerability_reads for bbm

Adam Cohenrequested to merge
444926-add-tmp-index-for-bbm into master

What does this MR do and why?

This MR adds a temporary index required for completing Add migration to resolve vulnerabilities from r... (!157776 - merged) • Adam Cohen • 17.3. See this comment for more details:

We should have this index created before the background migration scheduled.

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Related to #444926 (closed)

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