Clean up auto mapping names
# What does this PR do?

Clean up auto mapping names + add a check 🐕‍🦺 
so far on `main`
```bash
`layoutxlm` appears in the mapping `PROCESSOR_MAPPING_NAMES` but it is not defined  in the keys of `CONFIG_MAPPING_NAMES`.
`wav2vec2_with_lm` appears in the mapping `PROCESSOR_MAPPING_NAMES` but it is not defined  in the keys of `CONFIG_MAPPING_NAMES`.
`blip_2` appears in the mapping `MODEL_MAPPING_NAMES` but it is not defined in the keys of `CONFIG_MAPPING_NAMES`.
`decision_transformer_gpt2` appears in the mapping `MODEL_MAPPING_NAMES` but it is not defined in the keys of `CONFIG_MAPPING_NAMES`.
`nllb` appears in the mapping `MODEL_MAPPING_NAMES` but it is not defined in the keys of `CONFIG_MAPPING_NAMES`.

```<|||||>_The documentation is not available anymore as the PR was closed or merged._