Revert "[SYCL] Disable test assert_in_simultaneous_kernels due to flaky failures (intel#935)"

This reverts commit 03a9bca.

Author: KseniyaTikhomirova

SYCL/Assert/assert_in_simultaneous_kernels.cpp

@@ -1,6 +1,4 @@
-// Temporary disabled due to falky failures on level_zero with segmentation
-// fault
-// REQUIRES: linux, TEMPORARY_DISABLED
+// REQUIRES: linux
 // FIXME unsupported on CUDA and HIP until fallback libdevice becomes available
 // UNSUPPORTED: cuda || hip
 // RUN: %clangxx -DSYCL_FALLBACK_ASSERT=1 -fsycl -fsycl-targets=%sycl_triple %s -o %t.out %threads_lib