Remove the fedora-source-git and stream deployments

[mfocko]

Fedora-source-git & stream deployments are no longer used, since they are not deployed and we currently don't even plan on deploying them (we would need to request another CMDB entry, ESS, MP+ namespaces, etc.) let's remove them

• the files will be kept in the history anyways
• we can also simplify the structure of our variables

[majamassarini]

Still relevant.