[SYCL][Graph] Improve unsupported node update error

[Bensuo]

• Include node type in error message
• Fix unit test triggering topology error instead of unsupported node type error

Example output of new error:

terminate called after throwing an instance of 'sycl::_V1::exception'
  what():  node_type::memfill nodes are not supported for update. Only kernel, host_task, barrier and empty nodes are supported.