[UR] `UR_MEM_FLAG_USE_HOST_POINTER` test fails on all non-CPU devices

[callumfare]

There are long-standing known failures on the test for this urMemBufferCreate flag - https://github.com/intel/llvm/blob/sycl/unified-runtime/test/conformance/memory/urMemBufferCreate.cpp#L122

Essentially it looks like it only works on CPU devices.

Relates to https://github.com/intel/llvm/issues/9789 but the workaround described there means this test shouldn't fail.

[github-actions[bot]]

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