Add unit-test for otx.engine.engine & otx.core.utils

[harimkang]

Summary

How to test

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) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.08%. Comparing base (10f66e8) to head (1f3182f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3158      +/-   ##
===========================================
+ Coverage    64.18%   66.08%   +1.89%     
===========================================
  Files          182      182              
  Lines        15067    15067              
===========================================
+ Hits          9671     9957     +286     
+ Misses        5396     5110     -286     

Flag	Coverage Δ
py310	66.07% <ø> (+1.89%)	⬆️
py311	66.08% <ø> (+1.89%)	⬆️

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