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MINOR: Move tests, skip when no dataset is available (#42233)

Update tests that are making our minimal builds fail. The tests are unchanged and no new functionality is added. I moved the tests that were failing to the end of their blocks and added `skip_if_not_available("dataset")` since our minimal builds _don't_ include datasets and thus the snapshots that use datasets will be wrong there.

Authored-by: Jonathan Keane <jkeane@gmail.com>
Signed-off-by: Jonathan Keane <jkeane@gmail.com>