Migrate .js.erb files to .js

[MrSerth]

We want to get rid of .js.erb files, and hence migrate them to regular JavaScript files. Required attributes are passed through data-attributes in the HTML.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.74%. Comparing base (5dc4094) to head (533c8be).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2059      +/-   ##
==========================================
- Coverage   94.85%   94.74%   -0.12%     
==========================================
  Files         133      133              
  Lines        3385     3385              
==========================================
- Hits         3211     3207       -4     
- Misses        174      178       +4     

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