Add key to overview highlights to fix test warning

[cmdcolin]

fixes #4281

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.57%. Comparing base (82f305e) to head (f751b40).

Files	Patch %	Lines
...kWidget/components/Highlight/OverviewHighlight.tsx	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4285      +/-   ##
==========================================
- Coverage   62.60%   62.57%   -0.03%     
==========================================
  Files        1088     1088              
  Lines       31502    31500       -2     
  Branches     7531     7529       -2     
==========================================
- Hits        19721    19711      -10     
- Misses      11604    11615      +11     
+ Partials      177      174       -3     

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