[references] remove missed parts of old obj det

[felixdittrich92]

This PR:

• remove rest of old obj detection (i missed to remove it in [prototype] object det replacement / init contrib modules #1534)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.86%. Comparing base (630d925) to head (f0b4cbe).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1568      +/-   ##
==========================================
- Coverage   95.88%   95.86%   -0.02%     
==========================================
  Files         163      163              
  Lines        7649     7649              
==========================================
- Hits         7334     7333       -1     
- Misses        315      316       +1     

Flag	Coverage Δ
unittests	95.86% <ø> (-0.02%)	⬇️

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