[Bugfix] HeatmapHighChart: Prioritize configOverride over defaultOptions

[ms-kashyap]

Note: Recreating PR #1457 with signed commits.

Description

Context

When trying to create a heatmap using HeatmapHighChart, I had set legend: { enabled : true } but I was not seeing the legend in the heatmap.

It turns out that lodash.merge prioritizes values from right to left. Therefore, we should specify configOverride last since we want its values to be prioritzed over defaultOptions.

Showcasing bug

Original code:

Showcasing fix

Fix (swap configOverride and defaultOptions):

Checklist

• I have added screenshots above for all UI changes.
• Documentation was updated if it was needed.
• New tests were added or changes were manually verified.

[codecov-commenter]

Codecov Report

Merging #1490 (b23f275) into main (a34530c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1490   +/-   ##
=======================================
  Coverage   89.30%   89.30%           
=======================================
  Files          38       38           
  Lines        1617     1617           
=======================================
  Hits         1444     1444           
  Misses        173      173           

Flag	Coverage Δ
unittests	89.30% <ø> (ø)

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[romanlutz]

Thanks for recreating it!

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ms-kashyap/highchartsheatmap/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ms-kashyap/highchartsheatmap/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ms-kashyap/highchartsheatmap/dashboard/index.html

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/ms-kashyap/highchartsheatmap/dashboard/index.html