Reduce test_examples logs (#2800)

### Changes

- Removed progress bar logging from TF example;

### Reason for changes

- Not readable `test_examples` output;

### Related tickets

- 125253

### Tests

- test_examples/444 - as reference
- test_examples/446 - as result

examples/post_training_quantization/tensorflow/mobilenet_v2/main.py

@@ -22,6 +22,7 @@
 
 import nncf
 
+tfds.display_progress_bar(enable=False)
 ROOT = Path(__file__).parent.resolve()
 WEIGHTS_URL = "https://huggingface.co/alexsu52/mobilenet_v2_imagenette/resolve/main/tf_model.h5"
 DATASET_CLASSES = 10