Support non-USM devices by the tests

[dmitriy-sobolev]

Summary:
Many tests rely on USM. However, it is an optional feature, which is not supported by all the devices.

Preferred Solution:
Fall back to SYCL buffers if USM is not supported, turn off USM if it is already tested alongside with SYCL buffers.

Additional Context:
_PSTL_SYCL_TEST_USM controls USM usage, but it covers only a portion of tests, while some tests solely rely on USM.