Merge branch '368323-drop-index_vulnerabilities_on_state_case_id_desc' into 'master'

Remove index_vulnerabilities_on_state_case_id_desc index on vulnerabilities

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/104618



Merged-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: Omar Qunsul <oqunsul@gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Co-authored-by: Michał Zając <mzajac@gitlab.com>