[OpaquePointers] Fix SYCL end-to-end tests with enabled opaque pointers.

Following 7 tests are failing due to issues related to opaque pointers support. See https://github.com/intel/llvm/pull/9828.

~sycl/test-e2e/BFloat16/bfloat16_conversions.cpp~ Enabled by https://github.com/intel/llvm/pull/13695.
~sycl/test-e2e/BFloat16/bfloat16_type.cpp~ Enabled by https://github.com/intel/llvm/pull/13695.
sycl/test-e2e/BFloat16/bfloat16_vec.cpp
~sycl/test-e2e/DeviceLib/string_test.cpp~ Enabled by https://github.com/intel/llvm/pull/13695.
~sycl/test-e2e/ESIMD/ext_math.cpp~ Fixed by https://github.com/intel/llvm/pull/10848
~sycl/test-e2e/KernelFusion/internalize_array_wrapper.cpp~ Fixed by https://github.com/intel/llvm/pull/10882.
~sycl/test-e2e/Reduction/reduction_usm.cpp~ Enabled by https://github.com/intel/llvm/pull/13695.
sycl/test-e2e/Regression/local-arg-align.cpp Enabled on Linux by https://github.com/intel/llvm/pull/13783. Still disabled on Windows due to bug in the GPU driver.

We need to investigate these failures and re-enable execution with enabled opaque pointers.