Merge pull request #25519 from gursimarsingh:improved_classification_sample

Improved classification sample #25519

#25006 #25314

This pull requests replaces the caffe model for classification with onnx versions. It also adds resnet in model.yml. 

### 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
- [x] The PR is proposed to the proper branch
- [x] 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.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgproc/src/drawing_text.cpp

@@ -1404,10 +1404,11 @@ Point FontRenderEngine::putText_(
     if (weight != 0)
         for(j = 0; j <= BUILTIN_FONTS_NUM; j++)
         {
-            int params[] = {STBTT_FOURCC('w', 'g', 'h', 't'), saved_weights[j]};
             font_t* ttface = (j < BUILTIN_FONTS_NUM ? builtin_ffaces[j] : fontface)->ttface;
-            if (ttface)
-                stbtt_SetInstance(ttface, params, 1, 0);
+            if (!ttface || stbtt_GetWeight(ttface) == saved_weights[j])
+                continue;
+            int params[] = {STBTT_FOURCC('w', 'g', 'h', 't'), saved_weights[j]};
+            stbtt_SetInstance(ttface, params, 1, 0);
         }
 
     return pen;