Fix confusion matrix calculation

[harimkang]

Summary

https://jira.devtools.intel.com/browse/CVS-149491
but this PR is not root cause resolving

gt and pred idx generated from:

training_extensions/src/otx/api/usecases/evaluation/accuracy.py

Line 221 in 67be79b

task_labels = resultset.model.configuration.get_label_schema().get_labels(include_empty=True)

confusion matrix from:

training_extensions/src/otx/api/usecases/evaluation/accuracy.py

Line 326 in 67be79b

task_labels = resultset.model.configuration.get_label_schema().get_labels(include_empty=False)

above causes a mismatch in the label index.
Unify this to False.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• 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

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  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 80.66%. Comparing base (34fdc7c) to head (f35d0a6).
Report is 1 commits behind head on releases/1.6.0.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/1.6.0    #3857      +/-   ##
==================================================
- Coverage           80.66%   80.66%   -0.01%     
==================================================
  Files                 536      536              
  Lines               40538    40538              
==================================================
- Hits                32702    32700       -2     
- Misses               7836     7838       +2     

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[chuneuny-emily]

@harimkang - Are you going to merge this PR into release/1.6.0? If so, can you update the status "ready"?