TRADE-1167: Refactored grouping logic into separate function for reuse

[kecunning]

GitHub Issue: #215

Description

Refactored grouping logic into separate function for reuse. Updated files to use the new function and added a unit test for the new function.

Local test steps

Ran test in UAT and locally to confirm the results are the same.

Overview of integration done

PR Acceptance Checklist

• Unit tests added/updated and passing.
• Integration testing
• CHANGELOG.md updated
• Documentation updated (if needed).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.35%. Comparing base (984a578) to head (3cd9689).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #220      +/-   ##
===========================================
+ Coverage    84.02%   84.35%   +0.32%     
===========================================
  Files            4        4              
  Lines          144      147       +3     
===========================================
+ Hits           121      124       +3     
  Misses          23       23              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.