[SYCL] Cherry-pick of external semaphore fixes (#20196)
Cherry picks of bindless images semaphore fixes:
- [SYCL][BindlessImages] Fix external semaphore dependencies and return
events (https://github.com/intel/llvm/pull/20040)
(b578d545dde02747cba524473d7d7635cf149a46)
- [SYCL][BindlessImages] Fix storing result events for semaphores
(https://github.com/intel/llvm/pull/20080)
(68f3fdf41ca373e413c74da2949d807d3d7d777f)
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Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>
