Fix bug in `ImageClassifcation` task template
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['The CI failures are unrelated to the changes in this PR.'
 "> The CI failures are unrelated to the changes in this PR.\r\n\r\nIt seems that some of the failures are due to the tests on the dataset cards (e.g. CIFAR, MNIST, FASHION_MNIST). Perhaps it's worth addressing those in this PR to avoid confusing downstream developers who branch off `master` and suddenly have a failing CI?"
 '@lewtun We only run these tests against the modified datasets on the PR branch, so this will not lead to errors after merging.']
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Fixes a bug in the `ImageClassification` task template which requires specifying class labels twice in dataset scripts. Additionally, this PR refactors the API around the classification task templates for cleaner `labels` handling.

CC: @lewtun @nateraw
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