Reduce double-usage of CI XML files
Some pipelines use the same XML files. For instance,
RAN-NSA-B200-Module-LTEBOX-Container and RAN-LTE-{TDD,FDD}-LTEBOX-Container
use both fr1_epc_{closure,start}.xml, but use the core network on different
hosts, by means of different pipeline configuration (EPCtype, etc).
A future MR will remove these additional pipeline configuration, and store
all the CN config in the repository. To simplify the transition, duplicate
some XMLs (i.e., remove duplicate usage of them).
After this MR, the only "double usage" of XML files for core (un-)deployment
should be through pipelines RAN-LTE-{TDD,FDD}-LTEBOX-Container.