fix: optimize cxg matrix traversal

[nayib-jose-gloria]

No description provided.

[github-actions]

Deployment Summary

• backend_url: https://pr-7360-backend.rdev.single-cell.czi.technology
• backend_de_url: https://pr-7360-backend-de.rdev.single-cell.czi.technology
• backend_wmg_url: https://pr-7360-backend-wmg.rdev.single-cell.czi.technology
• frontend_url: https://pr-7360-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7360-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7360-migration:1

[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.91%. Comparing base (0f6646b) to head (ee26bf3).

Files with missing lines	Patch %	Lines
...nd/layers/processing/utils/cxg_generation_utils.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7360      +/-   ##
==========================================
- Coverage   92.91%   92.91%   -0.01%     
==========================================
  Files         194      194              
  Lines       16827    16825       -2     
==========================================
- Hits        15635    15633       -2     
  Misses       1192     1192              

Flag	Coverage Δ
unittests	92.91% <89.47%> (-0.01%)	⬇️

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