fix: Replace kornia gaussian filter which fails when exporting to ONNX

Coppied from openvinotoolkit#1990

src/anomalib/models/reverse_distillation/anomaly_map.py

@@ -15,7 +15,8 @@
 
 import torch
 import torch.nn.functional as F
-from kornia.filters import gaussian_blur2d
+# from kornia.filters import gaussian_blur2d
+from anomalib.models.components import GaussianBlur2d
 from omegaconf import ListConfig
 from torch import Tensor, nn
 
@@ -84,8 +85,12 @@ def forward(self, student_features: list[Tensor], teacher_features: list[Tensor]
             elif self.mode == AnomalyMapGenerationMode.ADD:
                 anomaly_map += distance_map
 
-        anomaly_map = gaussian_blur2d(
-            anomaly_map, kernel_size=(self.kernel_size, self.kernel_size), sigma=(self.sigma, self.sigma)
-        )
-
+        # anomaly_map = gaussian_blur2d(
+        #     anomaly_map, kernel_size=(self.kernel_size, self.kernel_size), sigma=(self.sigma, self.sigma)
+        # )
+        anomaly_map = GaussianBlur2d(
+            kernel_size=(self.kernel_size, self.kernel_size),
+            sigma=(self.sigma, self.sigma),
+        )(anomaly_map)
+
         return anomaly_map