Merge branch 'eduardosanz/alert32' into 'master'

Replace `flash` imports to `alert` - 32/36

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/113715



Merged-by: Simon Knox <simon@gitlab.com>
Approved-by: Simon Knox <simon@gitlab.com>
Approved-by: Samantha Ming <sming@gitlab.com>
Reviewed-by: Samantha Ming <sming@gitlab.com>
Co-authored-by: Eduardo Sanz García <esanz-garcia@gitlab.com>