Add PathForGoBinary

Add PathForGoBinary that uses pathForInstall to return the install
path of a GoBinaryTool.  This will replace various places that used
PathForOutput to reconstruct a path to a Go tool, and will support
moving Go tools to the Make install directory outside of the
PathForOutput directory in a future patch.

Bug: 204136549
Test: m checkbuild
Change-Id: I83a3be9f5c621975540f5ed601a0b9e2611c98b9