Remove all discard_queue_events tests for deprecated oneapi extension #1096
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This oneapi extension is now deprecated (intel/llvm#18059) and not intended for sycl-cts tests. Some of these tests now fail since the implementation is a no-op, so that tests that check for expected warnings fail. intel/llvm#18059 has kept core unit testing of basic SYCL functionality when using the no-op discard_events property (https://github.com/intel/llvm/tree/sycl/sycl/test-e2e/DeprecatedFeatures/DiscardEvents), which checks that the property doesn't alter expected behaviour. Since DPC++ is the only compiler using this extension, this should be sufficient and this duplicate CTS testing should be removed.