Disable Webhooks before proceeding with the GitHub import
Summary
Customer got ~2k builds piling up in a queue on the Codeship when start the GitHub import.
Description
Restoring all deleted branches temporarily is required to rebuild references to import the GitHub pull requests. The side effect is that the original repo may have API hooks (e.g. trigger CI builds) when new branches are created, to avoid this we need to disable Webhooks and warning people about this before proceeding with the import otherwise.