[TorchFX][Conformance] Move all models to export_for_training (#3078)

### Changes

All `capture_pre_autograd_graph` calls in the conformance test were
replaced by `torch.export.export_for_training`.

### Reason for changes

To remove deprecated `capture_pre_autograd_graph` from the conformance
test.

### Related tickets

#2766 

### Tests

post_training_quantization/555/ have finished succesfully

tests/post_training/pipelines/image_classification_torchvision.py

@@ -16,7 +16,6 @@
 import onnx
 import openvino as ov
 import torch
-from torch._export import capture_pre_autograd_graph
 from torchvision import models
 
 from nncf.torch import disable_patching
@@ -25,11 +24,11 @@
 from tests.post_training.pipelines.image_classification_base import ImageClassificationBase
 
 
-def _capture_pre_autograd_module(model: torch.nn.Module, args: Tuple[Any, ...]) -> torch.fx.GraphModule:
-    return capture_pre_autograd_graph(model, args)
+def _torch_export_for_training(model: torch.nn.Module, args: Tuple[Any, ...]) -> torch.fx.GraphModule:
+    return torch.export.export_for_training(model, args).module()
 
 
-def _export_graph_module(model: torch.nn.Module, args: Tuple[Any, ...]) -> torch.fx.GraphModule:
+def _torch_export(model: torch.nn.Module, args: Tuple[Any, ...]) -> torch.fx.GraphModule:
     return torch.export.export(model, args).module()
 
 
@@ -44,15 +43,15 @@ class ImageClassificationTorchvision(ImageClassificationBase):
     """Pipeline for Image Classification model from torchvision repository"""
 
     models_vs_model_params = {
-        models.resnet18: VisionModelParams(models.ResNet18_Weights.DEFAULT, _capture_pre_autograd_module),
+        models.resnet18: VisionModelParams(models.ResNet18_Weights.DEFAULT, _torch_export_for_training),
         models.mobilenet_v3_small: VisionModelParams(
-            models.MobileNet_V3_Small_Weights.DEFAULT, _capture_pre_autograd_module
+            models.MobileNet_V3_Small_Weights.DEFAULT, _torch_export_for_training
         ),
         models.vit_b_16: VisionModelParams(
-            models.ViT_B_16_Weights.DEFAULT, _export_graph_module, export_torch_before_ov_convert=True
+            models.ViT_B_16_Weights.DEFAULT, _torch_export_for_training, export_torch_before_ov_convert=True
         ),
         models.swin_v2_s: VisionModelParams(
-            models.Swin_V2_S_Weights.DEFAULT, _export_graph_module, export_torch_before_ov_convert=True
+            models.Swin_V2_S_Weights.DEFAULT, _torch_export, export_torch_before_ov_convert=True
         ),
     }