and migrate affected code _last refactoring bits to replace **util.OptionalBool** with **optional.Option[bool]**_ (cherry picked from commit a3f05d0d98408bb47333b19f505b21afcefa9e7c) Conflicts: services/repository/branch.go trivial context conflict
Currently we can add webhooks for organizations but not for users. This PR adds the latter. You can access it from the current users settings. ![grafik](https://user-images.githubusercontent.com/1666336/197391408-15dfdc23-b476-4d0c-82f7-9bc9b065988f.png)
This add system hook API