update mixin's methods

[Borda]

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What does this PR do?

make the methods consistent

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[Copilot]

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/litmodels/integrations/mixins.py:20

• [nitpick] Consider updating the docstring in the upload_model method to 'Upload the model to the registry' to match the new method name.

        "Push the model to the registry."

src/litmodels/integrations/mixins.py:32

• [nitpick] Consider updating the docstring in the download_model method to 'Download the model from the registry' for consistency with the method rename.

        "Pull the model from the registry."