Remove vulnerability_signatures_dedup_by_type feature flag

Adam Cohenrequested to merge
534898-cleanup-vulnerability_signatures_dedup_by_type into master

What does this MR do and why?

Removes the vulnerability_signatures_dedup_by_type feature flag

References

[Feature flag] Cleanup vulnerability_signatures... (#534898 - closed) • Adam Cohen • 18.3 • On track

Edited by Adam Cohen

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