Fix undefined in v-on handlers for vue 3 migration

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/134764



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Approved-by: Jacques Erasmus <jerasmus@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Reviewed-by: Jacques Erasmus <jerasmus@gitlab.com>
Reviewed-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Reviewed-by: Artur Fedorov <afedorov@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>