Add mapboxgl CSS to Plotly

[philippjfr]

Ensures Mapbox.gl CSS is loaded in Plotly plot, ensuring that map based plots correctly render attributions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.22%. Comparing base (9f51bb4) to head (bcba613).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7320      +/-   ##
==========================================
+ Coverage   81.79%   82.22%   +0.42%     
==========================================
  Files         337      337              
  Lines       50462    50498      +36     
==========================================
+ Hits        41274    41520     +246     
+ Misses       9188     8978     -210     

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