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Use semaphore for storing security reports

Brian Williams requested to merge bwill/use-semaphore-for-storing-security-reports into master

What does this MR do and why?

If many StoreSecurityReportsWorker jobs are running at the same time, this can cause database queries to timeout while they are waiting for locks to be released. This MR performs locking at the application level on a per-project basis, so that we don't experience these locks during database transactions.

Relates to: gitlab-com/gl-infra/production#17754 (closed)

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Edited by Brian Williams

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