fix wrong metrics count missing in vision explorer of RAI Vision dashboard for object detection

[imatiach-msft]

Description

fix wrong metrics count missing in vision explorer of RAI Vision dashboard for object detection

Several customers are seeing the wrong metrics count missing in RAI Vision dashboard - this was tracked down to extra whitespace added in the generate_od_error_labels methods for linting:

            rendered_labels[_AGGREGATE_LABEL] = \
                f"{sum(image_labels[_CORRECT].values())} {_CORRECT}, \
                  {sum(image_labels[_INCORRECT].values())} \
                  {_INCORRECT}"

The generated json file then had all of this whitespace for incorrect labels:

This extra whitespace at the start of the line caused parsing errors later in the UI code:

This PR fixes the issue and also adds some validation checks in the code.

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-wrong-labels-count-missing/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-wrong-labels-count-missing/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/fix-wrong-labels-count-missing/dashboard/index.html

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bee87b5) 88.84% compared to head (ffede21) 78.01%.

Files	Patch %	Lines
...i_vision/responsibleai_vision/utils/image_utils.py	97.14%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2495       +/-   ##
===========================================
- Coverage   88.84%   78.01%   -10.84%     
===========================================
  Files         134       14      -120     
  Lines        7737     1360     -6377     
===========================================
- Hits         6874     1061     -5813     
+ Misses        863      299      -564     

Flag	Coverage Δ
unittests	78.01% <97.14%> (-10.84%)	⬇️

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