Add validations for heterogeneity_features in causal manager

[gaugup]

Description

It seems like this validation was missing.

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 #1659 (3fcf838) into main (4b15495) will increase coverage by 1.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1659      +/-   ##
==========================================
+ Coverage   89.03%   90.20%   +1.17%     
==========================================
  Files         105       39      -66     
  Lines        5529     1716    -3813     
==========================================
- Hits         4923     1548    -3375     
+ Misses        606      168     -438     

Flag	Coverage Δ
unittests	90.20% <ø> (+1.17%)	⬆️

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

Impacted Files	Coverage Δ
...onsibleai/responsibleai/managers/causal_manager.py
.../databalanceanalysis/aggregate_balance_measures.py
responsibleai/responsibleai/_data_validations.py
raiwidgets/raiwidgets/error_handling.py
...leai/responsibleai/databalanceanalysis/__init__.py
...ibleai/responsibleai/managers/explainer_manager.py
...onsibleai/responsibleai/serialization_utilities.py
...sibleai/responsibleai/rai_insights/rai_insights.py
...sibleai/responsibleai/_tools/shared/base_result.py
...ponsibleai/responsibleai/_tools/shared/__init__.py
... and 56 more

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[github-actions]

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

[github-actions]

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

[github-actions]

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