Default enable reindex_malware_advisory_occurrence_refs

Rushik Subbarequested to merge
default-enable-reindex-malware-advisories-occurrence-refs into master

What does this MR do and why?

Default enable reindex_malware_advisory_occurrence_refs

gitlab_com_derisk flags cannot be default enabled, so the type moves to beta first.

References

Rollout issue: #628748

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