Make `Camembert` TF version independent from `Roberta`
Author: Mustapha-AJEGHRIR
Pull request: yes

# What does this PR do?
 related to #19303 

Making the Camembert model (`Tensorflow`version) independent from Roberta

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Camembert should not depend from roberta

## Before submitting
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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)

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- maintained examples (not research project or legacy): @sgugger, @patil-suraj
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@sgugger 

Comments:
_The documentation is not available anymore as the PR was closed or merged._

Hi @sgugger, I'm getting the following errors from circleci :
```python
FAILED tests/pipelines/test_pipelines_feature_extraction.py::FeatureExtractionPipelineTests::test_pt_LongformerConfig_LongformerModel_LongformerTokenizerFast_nofeature_extractor
FAILED tests/pipelines/test_pipelines_feature_extraction.py::FeatureExtractionPipelineTests::test_pt_LongformerConfig_LongformerModel_LongformerTokenizer_nofeature_extractor
```
I don't see why there is `Longformer` on the error while I haven't touched it.