fix error for automl object detection models when initializing error analysis and optimize explanation execution

[imatiach-msft]

Description

1.) Fix error for automl object detection models when initializing error analysis
2.) Optimize explanation execution by trying to get the inner automl model, thereby skipping logic to write mask back to base64 encoded string in DRISE

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/opt-automl-od/dashboard/index.html

[codecov-commenter]

Codecov Report

Merging #2245 (19cdb6a) into main (529af52) will decrease coverage by 15.12%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##             main    #2245       +/-   ##
===========================================
- Coverage   88.10%   72.99%   -15.12%     
===========================================
  Files         129       14      -115     
  Lines        7337     1244     -6093     
===========================================
- Hits         6464      908     -5556     
+ Misses        873      336      -537     

Flag	Coverage Δ
unittests	72.99% <0.00%> (-15.12%)	⬇️

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

Files Changed	Coverage Δ
...nsibleai_vision/managers/error_analysis_manager.py	79.85% <0.00%> (-1.17%)	⬇️
...responsibleai_vision/managers/explainer_manager.py	61.53% <0.00%> (-1.44%)	⬇️

... and 115 files with indirect coverage changes

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ilmat/opt-automl-od/dashboard/index.html