[Pipelines] Add revision tag to all default pipelines
Author: patrickvonplaten
Pull request: yes

# What does this PR do?

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Fixes #17666


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @LysandreJik

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
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Comments:
_The documentation is not available anymore as the PR was closed or merged._

@Narsil would this be ok for you? see: https://github.com/huggingface/transformers/issues/17666

I can add a simple slow test that iterates over the default pipelines to make sure that the pipeline is correctly loaded

PR is good to go for me. 

@Narsil could you please take a look at this comment: https://github.com/huggingface/transformers/pull/17667#discussion_r910987282 before merging - I think there is some dead code. Default tokenizer never seem to be called.

Also cc @sgugger PR should be ready otherwise

@Narsil approved offline (tokenizer_default code is dead indeed) => merging!