Fix issue with benches

[dalonsoa]

Description

A function had changed, so benches were failing.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[Copilot]

Pull request overview

This pull request updates the select_best_assets benchmark to match the current simulation API after a function change, so the benches compile and run again.

Changes:

• Replace the removed collect_investment_limits_for_candidates usage with collect_agent_addition_limits.
• Update benchmark setup and the select_best_assets call to pass agent addition limits.

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[tsmbland]

LGTM!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.30%. Comparing base (c3fbbca) to head (bf85b36).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1508   +/-   ##
=======================================
  Coverage   90.30%   90.30%           
=======================================
  Files          60       60           
  Lines        8658     8658           
  Branches     8658     8658           
=======================================
  Hits         7819     7819           
  Misses        525      525           
  Partials      314      314           

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