Fix `ImageSegmentationPipelineTests`
# What does this PR do?

- If the concept is approved, I can apply the same changes to other places)

- On `CircleCI`, we get `0.9469921875 not greater than or equal to 0.99`. Maybe I should lower the threshold ..?
-------

Fix `ImageSegmentationPipelineTests.test_small_model_pt`.

Compare hash of the output/expected masks is too flaky. This PR:
- get the current output masks, upload them to Hub
- use the uploaded masks as the new expected values
- only compare if the output/expected masks match with 99% or above

It should be safe to use the current output masks as the new expected masks, as the current output/expected masks seems match close:

```python
            [
                {
                    "label": "LABEL_88",
                    "mask": {"hash": "4e2da4b9a4", "shape": (480, 640), "white_pixels": 11},
                    "score": None,
                },
                {
                    "label": "LABEL_101",
                    "mask": {"hash": "9ec7310913", "shape": (480, 640), "white_pixels": 8946},
                    "score": None,
                },
                {
                    "label": "LABEL_215",
                    "mask": {"hash": "21dcfdc10d", "shape": (480, 640), "white_pixels": 298243},
                    "score": None,
                },
            ],
```


current expected values (before this PR):
```python
            [
                {
                    "label": "LABEL_88",
                    "mask": {"hash": "7f0bf661a4", "shape": (480, 640), "white_pixels": 3},
                    "score": None,
                },
                {
                    "label": "LABEL_101",
                    "mask": {"hash": "10ab738dc9", "shape": (480, 640), "white_pixels": 8948},
                    "score": None,
                },
                {
                    "label": "LABEL_215",
                    "mask": {"hash": "b431e0946c", "shape": (480, 640), "white_pixels": 298249},
                    "score": None,
                },
            ],
```
_The documentation is not available anymore as the PR was closed or merged._<|||||>Mark as draft in order to debug this super flaky test!<|||||>@sgugger  @Narsil @alaradirik  and others: ready for your review<|||||>@Narsil 

- no zip now
- I decided to simply use (for now) `.../blob/...` instead of `.../resolve/...` to link to the pages (where we can visualize the images, although not the full size).
  ```
  https://huggingface.co/datasets/hf-internal-testing/mask-for-image-segmentation-tests/blob/main/mask_0.png
  ```
  I don't like much the usage of  `datasets-server`:
    - too long
    - link strings not corresponding to file names

I am going to merge if you are OK 🙏 

