Create/Clone Issue(s) post-function should create the issue link during issue creation, not after
Right now, the Create/Clone Issue(s) post-function creates the link between the new and the current issues after the new issue is created.
Instead, it should create the issue link during the creation of the issue by passing it to the IssueService.
This way, the Create transition of the issue being created will see the issue link (e.g. in validators)