Add validations for dashboard endpoints

[gaugup]

Description

Adding a simple validation for which end points should be present in the widget to serve the dashboard.

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 #1672 (850d3c5) into main (6469f8b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1672   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files         105      105           
  Lines        5553     5553           
=======================================
  Hits         4936     4936           
  Misses        617      617           

Flag	Coverage Δ
unittests	88.88% <ø> (ø)

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[github-actions]

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

[github-actions]

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

[github-actions]

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