Merge branch 'mcelicalderonG-remove-unused-prepend' into 'master'

Remove unused prepend_mod for Issuable::Clone::BaseService

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/132941



Merged-by: James Fargher <jfargher@gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: James Fargher <jfargher@gitlab.com>
Co-authored-by: Mario Celi <mcelicalderon@gitlab.com>