This adds support for running Editor in BuildGraph Command and Commandlet tasks where the Project at hand has it's own BuildEnvironment.
#jira none
#rb ben.marsh
#preflight 6143be8d9bba9a0001dfc9ee
#ROBOMERGE-AUTHOR: geoff.evans
#ROBOMERGE-SOURCE: CL 17546102 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v870-17433530)
[CL 17546103 by geoff evans in ue5-release-engine-test branch]