Model overview: turn on heatmap colors by default

[romanlutz]

Description

Per popular request, this PR turns on the heatmap colors by default. This only shows up with the second cohort, of course, since there's no gradient with a single cohort:

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 #1510 (8b79669) into main (a33d2ac) will increase coverage by 4.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1510      +/-   ##
==========================================
+ Coverage   80.37%   84.89%   +4.51%     
==========================================
  Files          41       57      +16     
  Lines        1687     2886    +1199     
==========================================
+ Hits         1356     2450    +1094     
- Misses        331      436     +105     

Flag	Coverage Δ
unittests	84.89% <ø> (+4.51%)	⬆️

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

Impacted Files	Coverage Δ
erroranalysis/erroranalysis/analyzer/__init__.py	100.00% <0.00%> (ø)
erroranalysis/erroranalysis/version.py	100.00% <0.00%> (ø)
...is/erroranalysis/_internal/surrogate_error_tree.py	85.80% <0.00%> (ø)
erroranalysis/erroranalysis/_internal/utils.py	84.61% <0.00%> (ø)
...ranalysis/erroranalysis/_internal/matrix_filter.py	95.85% <0.00%> (ø)
erroranalysis/erroranalysis/report/__init__.py	100.00% <0.00%> (ø)
erroranalysis/erroranalysis/_internal/__init__.py	100.00% <0.00%> (ø)
...ranalysis/erroranalysis/_internal/cohort_filter.py	89.06% <0.00%> (ø)
...ranalysis/erroranalysis/analyzer/error_analyzer.py	92.89% <0.00%> (ø)
...erroranalysis/_internal/error_analyzer/__init__.py	100.00% <0.00%> (ø)
... and 6 more

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[github-actions]

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