Merge branch 'eduardosanz/replace-deprecated-createFlash-28' into 'master'

Replace `createFlash` by `createAlert` part 28

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105907



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Axel García <agarcia@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Co-authored-by: Eduardo Sanz García <esanz-garcia@gitlab.com>