Remove padding for page elements

[edknv]

Description

This PR removes padding from page element preprocessing. The padding_tuple parameter was originally required when the gRPC interface expected raw numpy arrays with uniform dimensions for batching. The interface has since moved to base64-encoded images, which handle variable-sized inputs natively.

bo767 on A100
throughput: 22.9 pages/sec -> 23.9 pages/sec
recall@5: 0.846 -> 0.847

earnings on A100
throughput: 25.6 pages/sec -> 26.3 pages/sec
recall@5: 0.628 -> 0.633

earnings on RTX A6000
throughput: 15.1 pages/sec -> 15.5 pages/sec

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• If adjusting docker-compose.yaml environment variables have you ensured those are mimicked in the Helm values.yaml file.

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