fix(affiliates): Fix logic in affiliate referred volume aggregation (backport #2623)

[mergify]

Changelist

Currently, when calculating referred volumes from new fills, if the taker is not referred, the fill is skipped directly so the maker volume (even if referred) does not count towards the affiliate's referred volume.
Fixed by independently adding volume from taker/maker.

This bug may result in protocol-view of affiliate referred volume being smaller than actual, potentially leading to lower than expected affiliate tier.

Test Plan

Unit test

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• New Features

  • Introduced a new method to aggregate referred volumes for affiliates, improving efficiency in processing referrals.

• Bug Fixes

  • Enhanced testing coverage for the affiliate referral system with a new test case for aggregating referred volumes.

---

This is an automatic backport of pull request #2623 done by [Mergify](https://mergify.com).

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