Merge pull request #26110 from Abdurrahheem:ash/hardmax-backend-fix

Switch off OpenVINO backend for Hardmax #26110

Fix Hardmax Issue with backend mentioned in #26107 

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [ ] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/dnn/src/layers/hardmax.cpp

@@ -2,7 +2,6 @@
 #include <opencv2/dnn/shape_utils.hpp>
 #include "../precomp.hpp"
 #include "layers_common.hpp"
-#include "../ie_ngraph.hpp"
 
 namespace cv
 {
@@ -18,7 +17,6 @@ public:
         axis = params.get<int>("axis", -1);
     }
 
-
     virtual bool supportBackend(int backendId) CV_OVERRIDE
     {
         return backendId == DNN_BACKEND_OPENCV;

modules/dnn/test/test_onnx_conformance_layer_filter__openvino.inl.hpp

@@ -550,6 +550,20 @@ CASE(test_edge_pad)
     // no filter
 CASE(test_einsum_batch_diagonal)
     SKIP;
+CASE(test_hardmax_axis_0)
+    SKIP;
+CASE(test_hardmax_axis_1)
+    SKIP;
+CASE(test_hardmax_axis_2)
+    SKIP;
+CASE(test_hardmax_default_axis)
+    SKIP;
+CASE(test_hardmax_example)
+    SKIP;
+CASE(test_hardmax_negative_axis)
+    SKIP;
+CASE(test_hardmax_one_hot)
+    SKIP;
 CASE(test_einsum_batch_matmul)
     // no filter
 CASE(test_einsum_inner_prod)