Merge branch '480869-refactor-duo-enterprise-alerts-partial-for-free-plan' into 'master'

Convert Duo Enterprise alert partial for free plan

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/170473



Merged-by: Aaron Huntsman <ahuntsman@gitlab.com>
Approved-by: Panos Kanellidis <pkanellidis@gitlab.com>
Approved-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Approved-by: Aaron Huntsman <ahuntsman@gitlab.com>
Co-authored-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>