[SYCL][E2E] Remove leaking part of non-uniform-wk-gp-test #15112
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As shown in #15111, currently sycl::stream will leak resources if an exception is thrown during launch of its associated command. This was in turn causing sycl/test-e2e/Basic/diagnostics/non-uniform-wk-gp-test.cpp to leak resources simply because it was using the stream in its testing. However, since the kernel should never execute, the stream did not serve a fundamental function in the test and was only there for additional debugging information in the case where the test would fail. As such, it is arguably better to improve coverage than to disable cases because of some potentially helpful additional output in the failing case.