Model overview: disable confirm button when no changes were made

[romanlutz]

Description

This PR disables the confirm button in the feature configuration flyout until actual changes were made to the previous selection:

Dashboard.-.Google.Chrome.2022-06-20.22-10-44.mp4

Previously, the button wouldn't get disabled unless we select more than 2 features.

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 #1509 (e9310d1) into main (e71bc37) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1509   +/-   ##
=======================================
  Coverage   87.27%   87.27%           
=======================================
  Files         108      108           
  Lines        5108     5108           
=======================================
  Hits         4458     4458           
  Misses        650      650           

Flag	Coverage Δ
unittests	87.27% <ø> (ø)

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[github-actions]

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

[github-actions]

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

[github-actions]

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

[github-actions]

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