Implement unit test for mmdeploy exporter for develop branch

[eunwoosh]

Summary

This PR includes unit tests for mmdeploy exporter.
It same as #3183, but for develop branch.

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 66.27%. Comparing base (176cdf5) to head (8cecba7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3184      +/-   ##
===========================================
+ Coverage    65.65%   66.27%   +0.62%     
===========================================
  Files          176      176              
  Lines        14932    14931       -1     
===========================================
+ Hits          9803     9895      +92     
+ Misses        5129     5036      -93     

Flag	Coverage Δ
py310	66.27% <100.00%> (+0.62%)	⬆️
py311	66.27% <100.00%> (+0.62%)	⬆️

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