Fix ignored reuse_existing in config file

[albertvillanova]

Fix ignored reuse_existing field in config file.

Currently, there is a reuse_existing field in all example config files for evaluation in inference endpoints. See for example:

lighteval/examples/model_configs/endpoint_model.yaml

Line 6 in 9315f0d

reuse_existing: false # if true, ignore all params in instance, and don't delete the endpoint after evaluation

or

lighteval/docs/source/evaluate-the-model-on-a-server-or-container.mdx

Line 35 in 9315f0d

reuse_existing: false # if true, ignore all params in instance, and don't delete the endpoint after evaluation

However, this field is ignored when parsing the config file because should_reuse_existing is parsed instead:

lighteval/src/lighteval/main_endpoint.py

Line 234 in 9315f0d

"should_reuse_existing": config["base_params"].get("should_reuse_existing"),

This PR fixes this issue by renaming should_reuse_existing to reuse_existing, so that it is aligned with the InferenceEndpointModel parameter name.

[HuggingFaceDocBuilderDev]

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