[SYCL][E2E] Re-enable AtomicRef/atomic_memory_order_seq_cst.cpp e2e test (#20436)
This PR removes `UNSUPPORTED` markings from
`AtomicRef/atomic_memory_order_seq_cst.cpp` test because test passes
locally.
Tested it on `Intel(R) oneAPI Unified Runtime over Level-Zero V2,
Intel(R) Arc(TM) B580 Graphics 20.1.0 [1.6.35096+9] `