Previously Issuable::Clone::BaseService copied an issuable notes,
award emoji, and award emoji on the issuable notes to another issue
through Issuable::Clone::ContentRewriter.

In order to implement
https://gitlab.com/gitlab-org/gitlab/-/issues/13426 in future, we need
to be able to copy design notes and their award emoji independently of
Issuable::Clone::ContentRewriter which was highly-coupled to issuables.

Issuable::Clone::BaseService now calls new services:

- Notes::CopyService
- AwardEmoji::CopyService
- ContentRewriterService

Which contain re-usable logic to perform those actions.