Added 'test' split support for Places365 dataset

[rbngz]

Closes #8741

The Places365 test-split does not contain labels. As a result, the returned target value is None for this case.

An alternative approach could be to return only the image without a corresponding target, either as a single value or as a tuple with a single item.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8928

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[NicolasHug]

Thanks @rbngz , this looks good, can you please try to address the typing issue: https://github.com/pytorch/vision/actions/runs/13450604526/job/37606910832?pr=8928

  torchvision/datasets/places365.py:134: error: Incompatible return value type
  (got "tuple[str, int | None]", expected "tuple[str, int]")  [return-value]
                  return path.join(self.images_dir, image.lstrip(sep).replac...
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...
  torchvision/datasets/places365.py:134: error: Item "None" of "str | None" has
  no attribute "lstrip"  [union-attr]
                  return path.join(self.images_dir, image.lstrip(sep).replac...
                                                    ^~~~~~~~~~~~
  Found 2 errors in 1 file (checked 235 source files)

[NicolasHug]

Thank you @rbngz