Update CODEOWNERS to add default reviewers for core-ui

[gaugup]

Description

It seems like there are no default CODEOWNERS for core-ui.

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 #1639 (2024dd8) into main (8484fc1) will decrease coverage by 3.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1639      +/-   ##
==========================================
- Coverage   89.01%   85.58%   -3.43%     
==========================================
  Files         105       58      -47     
  Lines        5489     2977    -2512     
==========================================
- Hits         4886     2548    -2338     
+ Misses        603      429     -174     

Flag	Coverage Δ
unittests	85.58% <ø> (-3.43%)	⬇️

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

Impacted Files	Coverage Δ
...ibleai/_tools/shared/state_directory_management.py
...ai/databalanceanalysis/feature_balance_measures.py
...ibleai/_tools/causal/dashboard_schemas/__init__.py
responsibleai/responsibleai/__version__.py
...onsibleai/_tools/shared/attribute_serialization.py
...ponsibleai/responsibleai/rai_insights/constants.py
...leai/responsibleai/modelanalysis/model_analysis.py
...eai/responsibleai/databalanceanalysis/constants.py
responsibleai/responsibleai/_data_validations.py
responsibleai/responsibleai/_interfaces.py
... and 37 more

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[github-actions]

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

[github-actions]

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

[github-actions]

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