Fix IOCGNS and IOParallelCGNS writer tests for optional dependencies.
The CNGS / parallel CGNS writer C++ tests depend on VTK::IOCGNSReader
and VTK:IOIOSS
. When building non-CANONICAL editions, these dependencies are not available, leading to configuration error with CMake if -DPARAVIEW_BUILD_TESTING=ON
. This is addressed in this MR, where inclusion of the tests is made dependent on whether these dependences are available or not.