chore: remove declaration maps

[SimenB]

Summary

They don't work anyways since we run prettier on Jest's built code, and they bloat the install size.

Test plan

🤷

[cpojer]

👍

[codecov-io]

Codecov Report

Merging #9822 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9822   +/-   ##
=======================================
  Coverage   64.88%   64.88%           
=======================================
  Files         289      289           
  Lines       12229    12229           
  Branches     3028     3030    +2     
=======================================
  Hits         7935     7935           
  Misses       3654     3654           
  Partials      640      640           

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[yordis]

They don't work anyway since we run prettier on Jest's built code

Why would you do that? -_-

[github-actions]

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