Remove group-level vulnerability report performance improvements FF

Mehmet Emin INACrequested to merge
minac_455263_cleanup_utilize_denormalized_attributes_for_group_level_vulnerability_reads_ff into master

What does this MR do and why?

This commit removes the feature flag and keeps the new logic related to group-level vulnerability page performance improvements.

Related to [Feature flag] Rollout of `utilize_denormalized... (#455263 - closed).

Edited by Mehmet Emin INAC

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