Merge branch 'Drop-confidence-columns-from-`vulnerabilities`-table' into 'master'

Remove confidence columns from vulnerabilities

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182637



Merged-by: Michał Zając <mzajac@gitlab.com>
Approved-by: Michał Zając <mzajac@gitlab.com>
Co-authored-by: anarinesingh <adinzey@gitlab.com>