Remove vulnerability_namespace_statistics_diff_aggregation feature flag

Gal Katzrequested to merge
gkatz_cleanup_vulnerability_namespace_statistics_diff_aggregation into master

What does this MR do and why?

Remove vulnerability_namespace_statistics_diff_aggregation feature flag

Changelog: changed
EE: true

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Before After

How to set up and validate locally

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability. Related to [Feature flag] Rollout of `vulnerability_namesp... (#526018 - closed) • Gal Katz

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