fix(prover): fix degrees logic in prover new

[amoylan2]

Purpose or design rationale of this PR

This is a complement for #1509

PR title

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• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
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• test: Adding missing tests or correcting existing tests

Deployment tag versioning

Has tag in common/version.go been updated or have you added bump-version label to this PR?

• No, this PR doesn't involve a new deployment, git tag, docker image tag
• Yes

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

[roynalnaruto]

We should:

• Move get_degrees to the common module
• Define get_degrees_inner in each of the darwin and darwin_v2 modules
• Fix darwin_v2's impl where you have still used prover_darwin::config (should be prover_darwin_v2::config

[roynalnaruto]

Looks good!