[SYCL][NFC] Introduce unit-tests for `ONEAPI_DEVICE_SELECTOR`#15774

AlexeySachkov merged 1 commit intointel:syclintel/llvm:syclfrom

AlexeySachkov:private/asachkov/oneapi-device-selector-unit-testsAlexeySachkov/llvm:private/asachkov/oneapi-device-selector-unit-testsCopy head branch name to clipboard