Adding support for managing multiple plugins, and specifying explicit versions to enable.
#rb joe.kirchoff
#preflight 62b3aedd7113a3a4a485adfc
#ROBOMERGE-OWNER: mike.beach
#ROBOMERGE-AUTHOR: mike.beach
#ROBOMERGE-SOURCE: CL 20801427 via CL 20801485 via CL 20801490
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v971-20777995)
[CL 20803672 by mike beach in ue5-main branch]