Better error handling cleanup

**Is your feature request related to a problem? Please describe.**

When auto fails, it should revert/cleanup any changes or commits it made.

Ex: when I have uncommitted changes and run auto, it will create a CHANGELOG commit, but then fail out when it detects the issue. Unfortunately, the CHANGELOG commit stays around.

**Describe the solution you'd like**

Plugins should tap into a cleanup hook to provide functionality to revert any changes it made.

**Describe alternatives you've considered**

Potentially, auto core could do all the cleanup, but that would be difficult depending on the different functionality of plugins.