Fix bug with PnL aggregation. (backport #2446)

[mergify]

Changelist

PnL aggregation was by block, however PnL ticks can be generated for the same hour at separate block heights (seconds to minutes apart).
Instead, aggregate PnL ticks by hour.

Test Plan

Unit tests.

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.
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Summary by CodeRabbit

• New Features

  • Introduced hourly aggregation for Profit and Loss (PnL) ticks, enhancing data granularity.

• Bug Fixes

  • Updated test cases to reflect new aggregation logic and ensure accurate results.

• Documentation

  • Improved comments and documentation within the code to clarify changes in aggregation methods and data structures.

---

This is an automatic backport of pull request #2446 done by [Mergify](https://mergify.com).

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