Stability improvements

* Add --user and -u parameter for `fastlane init` command (#8594) via Felix Krause
* Update messsage when Fastfile can't be found (#8592) via Felix Krause
* Add custom error message when the Developer Agreement wasn't accepted (#8595) via Felix Krause
* Fix using the Fastfile if parent dir isn't named fastlane (#8593) via Felix Krause
* Raise proper error message in spaceship if bundle_id is nil (#8596) via Felix Krause

https://github.com/fastlane/fastlane/releases/tag/2.22.0
