chore: remove legacy locale folder

[Shinigami92]

The locale folder was a relic from faker v5.5.3 times and was there to support NodeJS v12 and below that didn't know the package.json's exports field
We don't support the NodeJS versions anymore, and so it is even not possible to access this folder anymore, as the try to do this would result always in the dist folder via the exports mapping

FFR: https://nodejs.org/api/packages.html

[codecov]

Codecov Report

Merging #2263 (0eff5bb) into next (5f947cb) will decrease coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2263      +/-   ##
==========================================
- Coverage   99.60%   99.59%   -0.02%     
==========================================
  Files        2638     2638              
  Lines      244684   244684              
  Branches     1085     1082       -3     
==========================================
- Hits       243722   243694      -28     
- Misses        935      963      +28     
  Partials       27       27              

see 3 files with indirect coverage changes