Improvement suggestion - pass the list of modified files via cloud build manifest

This link specifies the type of data that is exposed via the "cloud build manifest" object: https://docs.unity3d.com/Manual/UnityCloudBuildManifest.html

It can be really nice to receive a list of files that were modified as part of a commit as well.

For example - our pre-export stage can scan that list and figure out if we should selectively build particular asset bundles before the actual game build.