[Graph] Support sycl reductions in graph nodes #18480
Description
SYCL-Graph currently doesn't support using SYCL reductions in graph nodes, as documented https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc#11-non-implemented-features-and-known-issues
This issue is to track providing support for that and add tests. If fundamental techical blockers are found, then the spec should be updated to say explicitly this isn't supported.