[OTX] remove dead code

[Harmjandevries]

https://jira.devtools.intel.com/browse/CVS-120764

Summary

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (790b7cf) 81.39% compared to head (2cfaa70) 81.37%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2528      +/-   ##
===========================================
- Coverage    81.39%   81.37%   -0.03%     
===========================================
  Files          518      517       -1     
  Lines        37933    37856      -77     
===========================================
- Hits         30877    30805      -72     
+ Misses        7056     7051       -5     

Flag	Coverage Δ
py310	81.36% <ø> (-0.03%)	⬇️
py38	81.35% <ø> (-0.03%)	⬇️
py39	81.35% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/otx/api/entities/model.py	98.78% <ø> (-0.02%)	⬇️
src/otx/api/usecases/adapters/model_adapter.py	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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