Model overview: add legend to probability line chart

[romanlutz]

Description

Adding a legend to the chart:

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 #1492 (758cb52) into main (e1f00d9) will increase coverage by 1.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1492      +/-   ##
==========================================
+ Coverage   87.57%   89.30%   +1.73%     
==========================================
  Files         110       38      -72     
  Lines        5093     1617    -3476     
==========================================
- Hits         4460     1444    -3016     
+ Misses        633      173     -460     

Flag	Coverage Δ
unittests	89.30% <ø> (+1.73%)	⬆️

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

Impacted Files	Coverage Δ
...onsibleai/responsibleai/serialization_utilities.py
.../responsibleai/_managers/counterfactual_manager.py
raiwidgets/raiwidgets/__init__.py
raiwidgets/raiwidgets/explanation_dashboard.py
...bleai/responsibleai/_tools/causal/causal_config.py
.../responsibleai/_managers/error_analysis_manager.py
responsibleai/responsibleai/_config/__init__.py
...ponsibleai/responsibleai/_tools/shared/__init__.py
...sibleai/responsibleai/_tools/shared/base_result.py
raiwidgets/raiwidgets/constants.py
... and 62 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e1f00d9...758cb52. Read the comment docs.

[github-actions]

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

[github-actions]

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

[github-actions]

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

[github-actions]

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

[github-actions]

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