fix(configuration_llama): add `keys_to_ignore_at_inference` to `LlamaConfig`
Author: calico-1226
Pull request: yes

# What does this PR do?

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Fixes #23890


## 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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- [ ] Did you write any new necessary tests?


## Who can review?

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Models:

- text models: @ArthurZucker and @younesbelkada
- vision models: @amyeroberts
- speech models: @sanchit-gandhi
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Library:

- flax: @sanchit-gandhi
- generate: @gante
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Integrations:

- deepspeed: HF Trainer: @stas00, Accelerate: @pacman100
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HF projects:

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- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

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- Flax: @sanchit-gandhi
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@ArthurZucker and @younesbelkada

Comments:
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