Remove some pipeline skip cases
# What does this PR do?

Remove some pipeline skip cases after #22428: the real tokenizers avoid a lot of failing cases - except for QA with slow tokenizers.

P.S. As discussed once on Slack: the QA pipeline with slow tokenizer uses some methods in `src/transformers/data/processors/squad.py`, and we plan not to make any change to this file.
_The documentation is not available anymore as the PR was closed or merged._