[Offload][AMDGPU] Fix olQueryQueue uninitialized output parameter (#178464)
## Summary
- Fix uninitialized output parameter in `olQueryQueue_impl` when
`Queue->AsyncInfo->Queue` is null
- Set `IsQueueWorkCompleted` to `true` when no underlying queue exists
(no pending work)
- Resolves test failure on AMDGPU for
`olQueryQueueTest.SuccessEmptyAsyncQueueCheckResult`
Fixes #178462.
## Test plan
- [x] Fixed
`OffloadAPI/queue.unittests/olQueryQueueTest/SuccessEmptyAsyncQueueCheckResult/AMDGPU_AMD_Radeon_RX_7700_XT_0`
test
- [ ] CI tests pass
---------
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
Co-authored-by: Joseph Huber <huberjn@outlook.com>