updating name from UnrealGameSyncWebAPI to UnrealGameSyncMetadataService
#jira none
#rb none
#ROBOMERGE-SOURCE: CL 4125680 in //UE4/Release-4.20/...
#ROBOMERGE-BOT: RELEASE (Release-4.20 -> Release-Staging-4.20)
[CL 4125681 by chad garyet in Staging-4.20 branch]