Rename OLMo November to OLMo2

[2015aroras]

What does this PR do?

This PR renames the recently-added OLMo November 2024 model to OLMo2.

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?

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@ArthurZucker