Replace rollup-plugin-sourcemaps with rollup-plugin-sourcemaps2

[birkskyum]

Closes #4739

• Obsolete rollup-plugin-sourcemap #4739

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.77%. Comparing base (8ff7d2a) to head (01cc059).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4740      +/-   ##
==========================================
- Coverage   87.90%   87.77%   -0.14%     
==========================================
  Files         247      247              
  Lines       33656    33656              
  Branches     2148     2181      +33     
==========================================
- Hits        29585    29540      -45     
- Misses       3103     3140      +37     
- Partials      968      976       +8     

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[HarelM]

LGTM assuming it does the job.