Skip 2 tests in `VisionTextDualEncoderProcessorTest`
# What does this PR do?

These 2 tests in `VisionTextDualEncoderProcessorTest` will be fixed when we add the new `AutoImageProcessor`.

Current error is

```bash
AttributeError: 'NoneType' object has no attribute 'from_dict
```
_The documentation is not available anymore as the PR was closed or merged._