[CI][SYCL] Enable CTS testing of New Offload Model in SYCL Nightly
This patch enables testing of New Offload Model for CTS tests in the
nightly workflow, following the same pattern used for E2E tests.
Changes:
* CTS build and run jobs are now parameterized with
enable_new_offload_model matrix: ['False', 'True']
* The --offload-new-driver flag is passed via -DCMAKE_CXX_FLAGS in
extra_cmake_args when New Offload Model is enabled
* Artifact names are differentiated between old and new offload models
to allow separate binaries for each configuration
* Both Linux and Windows CTS tests now run with both offload models
This doubles the CTS test coverage in nightly runs, testing both Old
and New Offload Models on Linux (OCL CPU, L0 gen12) and Windows
(L0 gen12).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
