[ci] Remove cloning and setup for mrSegmentation

[cbentejac]

Description

This pull request simplifies the continuous integration workflow by removing the steps and environment variables related to cloning and referencing the mrSegmentation repository. The workflow now focuses solely on installing dependencies for the project itself.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.46%. Comparing base (ad20cc5) to head (183699a).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2841   +/-   ##
========================================
  Coverage    77.46%   77.46%           
========================================
  Files           48       48           
  Lines         6735     6735           
========================================
  Hits          5217     5217           
  Misses        1518     1518           

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