fix error analysis for RAITextInsights displaying all incorrect instances for text labels

[imatiach-msft]

Description

On the DBPedia dataset, fix error analysis for RAITextInsights displaying all incorrect instances for text labels:

Note this is only happening for a particular multiclass text classification case where the predicted label is a numpy int type.

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.

[codecov-commenter]

Codecov Report

Merging #2325 (11a682d) into main (7b7054f) will decrease coverage by 9.86%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2325      +/-   ##
==========================================
- Coverage   88.53%   78.68%   -9.86%     
==========================================
  Files         133       26     -107     
  Lines        7581     2191    -5390     
==========================================
- Hits         6712     1724    -4988     
+ Misses        869      467     -402     

Flag	Coverage Δ
unittests	78.68% <100.00%> (-9.86%)	⬇️

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

Files Changed	Coverage Δ
...ponsibleai_text/managers/error_analysis_manager.py	88.65% <100.00%> (+0.79%)	⬆️

... and 109 files with indirect coverage changes

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