tweak handling of orders without signing address

[dvush]

📝 Summary

Better handle orders without signer address

💡 Motivation and Context

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✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

crates/rbuilder/src/backtest/redistribute/mod.rs:506

• [nitpick] Changing the log level from warn to error could lead to excessive error logging if orders missing redistribution addresses are expected in some scenarios. Please confirm that this behavior is intentional.

error!(order = ?order_id, "Included order redistribution address not found");

crates/rbuilder/src/backtest/redistribute/mod.rs:495

• [nitpick] Consider renaming 'included_without_address' to a more descriptive name such as 'ordersMissingAddress' to clarify its purpose.

let mut included_without_address = HashSet::default();