Task #5681: Initial system validation framework for Cobalt nodes

.gitattributes

.../Online_Cobalt/validation/tests/gpu/persistence-mode.test

...ms/Online_Cobalt/validation/tests/hardware/sata-ahci.test

SubSystems/Online_Cobalt/validation/tests/mpi/basic-mpi.test

...ne_Cobalt/validation/tests/mpi/custom-openmpi-config.test

SubSystems/Online_Cobalt/validation/tests/network/hosts.test

...ms/Online_Cobalt/validation/tests/network/resolvconf.test

...tems/Online_Cobalt/validation/tests/network/routes.cbt001

...tems/Online_Cobalt/validation/tests/network/routes.cbt002

...tems/Online_Cobalt/validation/tests/network/routes.cbt003

...tems/Online_Cobalt/validation/tests/network/routes.cbt004

...tems/Online_Cobalt/validation/tests/network/routes.cbt005

...tems/Online_Cobalt/validation/tests/network/routes.cbt006

...tems/Online_Cobalt/validation/tests/network/routes.cbt007

...tems/Online_Cobalt/validation/tests/network/routes.cbt008

...tems/Online_Cobalt/validation/tests/network/routes.cbt009

...ystems/Online_Cobalt/validation/tests/network/routes.test

SubSystems/Online_Cobalt/validation/tests/os/gdb.test

SubSystems/Online_Cobalt/validation/tests/os/limits.test

SubSystems/Online_Cobalt/validation/tests/packages/atop.test