Bug fixes

* [pilot] when only specifying a changelog, do not overwrite other build test info (such as feedback_email or description) (#9020) via Mark Pirri
* [pilot/deliver] Use the newest item as default when specifying an .ipa or .pkg paths (#8982) via Chris Graham
* [pilot] Improve testing around TestFlight methods in spaceship and fastlane_core (#8962) via Stefan Natchev
* [pilot] Fix bug preventing `pilot distribute` from working without first uploading a build (#9005) via Aman Gupta
* Assorted refactors and other cleanup (#8985) via Joshua Liebowitz

https://github.com/fastlane/fastlane/releases/tag/2.28.6
