Fixed bugs in JetMoE models.
Author: Phoenix-Shen
Pull request: yes

# What does this PR do?

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Fixes issue #31791.
1. Fixed bugs in JetMoE casual language model and sequence classification model.
2. The original code will report errors when we want to output the `aux_loss`, like described in the issue.
3. I have modified `JetMoeForCausalLM` and `JetMoeForSequenceClassification`, now they work properly and output `aux_loss`, 
4. Meanwhile I have followed `MoeCausalLMOutputWithPast` class to write a new class named `MoESequenceClassifierOutputWithPast` to store the results of `JetMoeForSequenceClassification` model.
5. The code have passed the test of `tests/models/jetmoe/test_modeling_jetmoe.py`.

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## Who can review?
@ArthurZucker


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Comments:
`ci/circleci: tests_torch_and_tf` error doesn't seem to be a problem with the code I submitted.

The `check_code_quality` error can be fixed with this command:
`ruff format src/transformers/models/jetmoe/modeling_jetmoe.py`.
The `tests_torch_and_tf` will usually be automatically fixed after a resubmission.

> The `check_code_quality` error can be fixed with this command: `ruff format src/transformers/models/jetmoe/modeling_jetmoe.py`. The `tests_torch_and_tf` will usually be automatically fixed after a resubmission.

Thanks a lot, I have already formatted the files under your guidance.

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_31824). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

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