test error due to unstable data downloading

[wyli]

Describe the bug

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ERROR: test_read_patches_cucim_0 (tests.test_patch_wsi_dataset.TestPatchWSIDataset)
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Traceback (most recent call last):
  File "/home/runner/work/MONAI/MONAI/tests/test_patch_wsi_dataset.py", line 111, in setUp
    download_url(FILE_URL, FILE_PATH, "5a3cfd4fd725c50578ddb80b517b759f")
  File "/home/runner/work/MONAI/MONAI/monai/apps/utils.py", line 196, in download_url
    raise RuntimeError(
RuntimeError: Download of file from https://drive.google.com/uc?id=1sGTKZlJBIz53pfqTxoTqiIQzIoEzHLAe to /home/runner/work/MONAI/MONAI/tests/testing_data/temp_1sGTKZlJBIz53pfqTxoTqiIQzIoEzHLAe.tiff failed due to network issue or denied permission.

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we can skip the tests whenever the testing data fetching fails.