[CODEOWNER] Update onwership for kernel fusion (#9040)

Added end to end tests and kernel fusion design document.

Signed-off-by: Victor Lomuller <[email protected]>

Author: Naghasan

.github/CODEOWNERS

@@ -89,6 +89,7 @@ devops/ @intel/dpcpp-devops-reviewers
 
 # Kernel fusion JIT compiler
 sycl-fusion/ @victor-eds @Naghasan @sommerlukas
+sycl/doc/design/KernelFusionJIT.md @victor-eds @Naghasan @sommerlukas
 sycl/doc/extensions/experimental/sycl_ext_codeplay_kernel_fusion.asciidoc @victor-eds @Naghasan @sommerlukas
 sycl/include/sycl/ext/codeplay/experimental/fusion_properties.hpp  @victor-eds @Naghasan @sommerlukas
 sycl/include/sycl/ext/codeplay/experimental/fusion_wrapper.hpp @victor-eds @Naghasan @sommerlukas
@@ -97,3 +98,4 @@ sycl/source/detail/jit_compiler.hpp @victor-eds @Naghasan @sommerlukas
 sycl/source/detail/jit_compiler.cpp @victor-eds @Naghasan @sommerlukas
 sycl/source/detail/jit_device_binaries.hpp @victor-eds @Naghasan @sommerlukas
 sycl/source/detail/jit_device_binaries.cpp @victor-eds @Naghasan @sommerlukas
+sycl/test-e2e/KernelFusion @victor-eds @Naghasan @sommerlukas