Disable more G-API streaming test due to unstability.

modules/gapi/test/infer/gapi_infer_ie_test.cpp

@@ -1825,6 +1825,9 @@ TEST(InferList, TestStreamingInfer)
 
 TEST(Infer2, TestStreamingInfer)
 {
+    if (cvtest::skipUnstableTests)
+        throw SkipTestException("Skip InferROI.TestStreamingInfer as it hangs sporadically");
+
     initDLDTDataPath();
 
     std::string filepath = findDataFile("cv/video/768x576.avi");