Build History should clean out old operations

[mwasplund]

Describe the bug When the build is successful the build history should be cleared to remove old operations. It should still keep un-run operations for failed incremental builds, but when an operation replaces another we should not keep them both since only one will be valid.

To Reproduce Steps to reproduce the behavior:

1. Build with a set of macros predefined
2. Build with a different set

Expected behavior Only one operation should be tracked, but instead it has both versions