urEnqueueEventsWait on the L0 adapter require doube-release of result event

[steffenlarsen]

As observed in intel/llvm#16112, the L0 variant of urEnqueueEventsWait will leak the queue and output event unless urEventRelease us called twice on the result event.

[KseniyaTikhomirova]

@nrspruit do you have any progress with this issue?