[SYCL][E2E] Re-enable interop_all_backends.cpp test (#15767)

The capitalization of cuda and hip in
`Basic/interop/interop_all_backends.cpp` makes the test always
unsupported. This patch removes the requires line, and refactors how the
test is built so that we build an executable for each backend.

sycl/test-e2e/Basic/interop/interop_all_backends.cpp

@@ -1,25 +1,29 @@
-// REQUIRES: CUDA || HIP
-// RUN: %{build} %if hip %{ -DSYCL_EXT_ONEAPI_BACKEND_HIP %} %else %{ %if cuda %{ -DSYCL_EXT_ONEAPI_BACKEND_CUDA_EXPERIMENTAL %} %else %{ %if level_zero %{ -DSYCL_EXT_ONEAPI_BACKEND_L0 %} %} %} -o %t.out
+// XFAIL: any-device-is-opencl, any-device-is-cuda, (windows && any-device-is-level_zero)
+// XFAIL-TRACKER: https://github.com/intel/llvm/issues/15819
+// RUN: %if any-device-is-opencl %{ %{build} -o %t-opencl.out %}
+// RUN: %if any-device-is-level_zero %{ %{build} -DBUILD_FOR_L0 -o %t-l0.out %}
+// RUN: %if any-device-is-cuda %{ %{build} -DBUILD_FOR_CUDA -o %t-cuda.out %}
+// RUN: %if any-device-is-hip %{ %{build} -DBUILD_FOR_HIP -o %t-hip.out %}
 
 #include <sycl/backend.hpp>
 #include <sycl/detail/core.hpp>
 #include <sycl/properties/all_properties.hpp>
 #include <sycl/usm.hpp>
 using namespace sycl;
 
-#ifdef SYCL_EXT_ONEAPI_BACKEND_CUDA_EXPERIMENTAL
+#ifdef BUILD_FOR_CUDA
 #include <sycl/ext/oneapi/experimental/backend/cuda.hpp>
 constexpr auto BACKEND = backend::ext_oneapi_cuda;
 using nativeDevice = CUdevice;
 using nativeQueue = CUstream;
 using nativeEvent = CUevent;
-#elif defined(SYCL_EXT_ONEAPI_BACKEND_HIP)
+#elif defined(BUILD_FOR_HIP)
 #include <sycl/ext/oneapi/backend/hip.hpp>
 constexpr auto BACKEND = backend::ext_oneapi_hip;
 using nativeDevice = hipDevice_t;
 using nativeQueue = hipStream_t;
 using nativeEvent = hipEvent_t;
-#elif defined(SYCL_EXT_ONEAPI_BACKEND_L0)
+#elif defined(BUILD_FOR_L0)
 constexpr auto BACKEND = backend::ext_oneapi_level_zero;
 using nativeDevice = ze_device_handle_t;
 using nativeQueue = ze_command_queue_handle_t;