[Bindless][SYCL][UR] Create a sampled image with a single UR API

[GeorgeWeb]

We no longer need to create a UR sampler object in order to create a sampled image. The backends can simply use the sampler description to create the sampled image.

Note this is an ABI break in the currently still experimental bindless images extension for Unified Runtime.

Addresses the following issue: oneapi-src/unified-runtime#1463
Relevant discussion from oneapi-src/unified-runtime#2640 (comment)

Additionally, avoiding the allocation of a sampler object itself fixes memory leak(s) in all adapters where the UR sampler handle was never released which was caused by the use of the API in the SYCL RT only calling urSamplerCreate and not Release for the sampler associated with the image. Also, while HIP and Cuda do not further create backend specific sampler objects in the respective adapters, Level Zero was creating one that never got released upon freeing the image memory which lead to leaking the Level Zero sampler memory as well. Now that Level Zero can create a sampled image from a descriptor only, the sampler object is not needed altogether, allowing to rid of the above mentioned leaking memory allocations and simplify the runtime.

[aarongreig]

UR + CL LGTM

[przemektmalon]

Minor comments and one missing error check, otherwise LGTM.

[GeorgeWeb]

The following CI failures for Intel Arc A Series GPUs are unrelated.
(https://github.com/intel/llvm/actions/runs/14972970580/job/42059340348)

Failed Tests (4):
  SYCL :: KernelAndProgram/cache_env_vars.cpp
  SYCL :: KernelAndProgram/cache_env_vars_lin.cpp
  SYCL :: KernelCompiler/opencl.cpp
  SYCL :: KernelCompiler/sycl_cache_pm.cpp

These appeared after rebasing.
See issue #18416.

[wenju-he]

LGTM, thanks

[GeorgeWeb]

The following CI failures for Intel Arc A Series GPUs are unrelated.
(https://github.com/intel/llvm/actions/runs/15024003764/job/42222242149?pr=18384)

Failed Tests (3):
  SYCL :: Adapters/level_zero/interop-buffer-ownership.cpp
  SYCL :: Adapters/level_zero/usm_device_read_only.cpp
  SYCL :: Basic/buffer/buffer_create.cpp

See issue #18463.

[GeorgeWeb]

@intel/llvm-gatekeepers This PR is ready to merge.
The CI failures are unrelated, so I'll leave it to you if you'd prefer waiting to get the CI green once a fix for those issues is merged before merging this PR.