tests: fix pytorch tensor placement errors (#33485)

This commit fixes the following errors:
* Fix "expected all tensors to be on the same device" error
* Fix "can't convert device type tensor to numpy"

According to pytorch documentation torch.Tensor.numpy(force=False)
performs conversion only if tensor is on CPU (plus few other restrictions)
which is not the case. For our case we need force=True since we just
need a data and don't care about tensors coherency.

Fixes: #33517
See: https://pytorch.org/docs/2.4/generated/torch.Tensor.numpy.html

Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>

tests/models/informer/test_modeling_informer.py

@@ -170,7 +170,7 @@ class InformerModelTester:
 
         embed_positions = InformerSinusoidalPositionalEmbedding(
             config.context_length + config.prediction_length, config.d_model
-        )
+        ).to(torch_device)
         self.parent.assertTrue(torch.equal(model.encoder.embed_positions.weight, embed_positions.weight))
         self.parent.assertTrue(torch.equal(model.decoder.embed_positions.weight, embed_positions.weight))