[SYCL][BindlessImages] Fix external semaphore dependencies and return events (#20040)
This commit fixes an issue where bindless images semaphore operations
(signal/wait) would neither use dependency events of the submission nor
return the corresponding event from the backend operation. This commit
fixes both of these issues.
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Signed-off-by: Larsen, Steffen <steffen.larsen@intel.com>