.xml metadata files are generated exclusively using TestMode, from values of TestMetadata set from the module class
RunUBT -Mode=Test -GenerateMetadata
To support additional NDA platforms, build modules must be created.
Cleanup unused metadata files from the previous generation system.
#jira UE-195038
#rb Jerome.Delattre
[CL 33373724 by chris constantinescu in ue5-main branch]