Move missing value validations before unique value validations

[gaugup]

Description

The np.unique() call downstream will fail in case of missing values in data. So doing the missing value validation up front.

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 #2228 (a4fe8ea) into main (9ed4a86) will increase coverage by 4.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2228      +/-   ##
==========================================
+ Coverage   88.09%   92.26%   +4.16%     
==========================================
  Files         129      103      -26     
  Lines        7334     5157    -2177     
==========================================
- Hits         6461     4758    -1703     
+ Misses        873      399     -474     

Flag	Coverage Δ
unittests	92.26% <100.00%> (+4.16%)	⬆️

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Files Changed	Coverage Δ
...sibleai/responsibleai/rai_insights/rai_insights.py	87.74% <100.00%> (ø)

... and 26 files with indirect coverage changes

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[github-actions]

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[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/gaugup/MoveValidations/dashboard/index.html

[github-actions]

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