Implement commit list pagination

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Description

This is part of a bigger effort to refactor the repository Commit list.

As part of this issue we should:

1. Enable pagination on the frontend using Keyset pagination
2. Paginate via the GraphQL query using an offset and limit (or cursor if #542535 (closed) is done by the time this is picked up)
3. If #542535 (closed) is not done yet, open a follow-up issue for frontend to switch to cursor-based pagination and mark it as blocked by #542535 (closed).