Add option for the build status to be tied to commit AND the branch

Currently, all the build states are tied to the commit that triggered the build.

However, in some cases, that commit might be part of multiple different branches that have different pipeline definitions, and all of them will override the same build status in the commit. So a pipeline for the same commit might fail for one branch, and succeed for another.

This feature request is to implement an option for the build status to be pinned to the combination of branch+commit.