[references] Detection - Allow built-in datasets usage

[felixdittrich92]

This PR:

• Update detection train script to allow using built-in datasets
• Update references READMEs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.93%. Comparing base (3d5ca38) to head (92813c2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2081      +/-   ##
==========================================
+ Coverage   96.89%   96.93%   +0.03%     
==========================================
  Files         156      156              
  Lines        7535     7535              
==========================================
+ Hits         7301     7304       +3     
+ Misses        234      231       -3     

Flag	Coverage Δ
unittests	96.93% <ø> (+0.03%)	⬆️

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