Magstats step using oid

[AlxEnashi]

Summary of the changes

Changed the calculators to group by oid instead of aid

About this PR:

• You added the necessary documentation for the team to understand your work.
• You linked this PR to the corresponding issue or user story.
• Your changes fulfill the Definition of Done of the issue or user story.
• Your changes were tested with manual testing before being submitted.
• Your changes were tested with automatic unit tests.
• Your changes were tested with automatic integration tests.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (aab2d2e) 75.09% compared to head (7d210ea) 97.11%.
Report is 27 commits behind head on main.

Files	Patch %	Lines
magstats_step/magstats_step/step.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #366       +/-   ##
===========================================
+ Coverage   75.09%   97.11%   +22.02%     
===========================================
  Files           8        5        -3     
  Lines         277      243       -34     
===========================================
+ Hits          208      236       +28     
+ Misses         69        7       -62     

Flag	Coverage Δ
unittest	97.11% <83.33%> (+22.02%)	⬆️

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