Change the copy in the General settings for fork relationship

Context in epic: &4405 (closed)

Context in original issue: #241804 (closed)

We need to change the copy of the fork relationship destroying in general settings

1. Once removed, the fork relationship cannot be restored. and you will no longer be able to send merge requests to the sourceThis project will no longer be able to receive or send merge requests to the source project or other forks.