[SYCL][Unittests] Fix unloading of mock images on Windows #19068
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The implementation of mock images try to unload the images using __sycl_unregister_lib. However, this is a no-op on Windows under the assumption that shutdown will handle the images. This causes unittests, like RootGroup, to leave dead binaries in the program manager that subsequent test runs may pick up. This commit fixes this issue by having the mock image arrays forciby remove the images from the program manager instead.