Changing model default for TableQuestionAnsweringPipeline.
Author: Narsil
Pull request: yes

# What does this PR do?

Niels removed his tapas model from the Hub, so we need to update the default to `google` organization

- Discussion: https://discuss.huggingface.co/t/table-question-answering-is-not-an-available-task-under-pipeline/3284/6
- Had to update the slow test that was out-of-sync I think, @LysandreJik can you confirm ?



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Fixes # (issue)


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