Allow separate configurations for rucio config for components and test CE
Currently, WMS forces a single rucio config for the service components and the test CE, but
- Components need root access to query all available files and can use long-lasting credentials (password, oidc client, x509 cert)
- CE needs to use the user x509 proxy and DIRAC determines the user account from the proxy somehow:
this last part is something I wasn't aware of until now, but makes sense: the configuration is put on cvmfs for all users without account information.