Refactor Random agents insertion

[Grufoony]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 81.57895% with 7 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@326dcd9). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/dsf/mobility/FirstOrderDynamics.hpp	84.00%	4 Missing ⚠️
src/dsf/mobility/FirstOrderDynamics.cpp	77.77%	2 Missing ⚠️
src/dsf/mdt/TrajectoryCollection.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #503   +/-   ##
=======================================
  Coverage        ?   83.99%           
=======================================
  Files           ?       54           
  Lines           ?     8478           
  Branches        ?     1006           
=======================================
  Hits            ?     7121           
  Misses          ?     1340           
  Partials        ?       17           

Flag	Coverage Δ
unittests	83.99% <81.57%> (?)

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