chore: Remove ember-l10n/test-helpers

[iamareebjamal]

Deprecated and spams the console

[vercel]

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[codecov]

Codecov Report

Merging #4284 into development will not change coverage by %.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4284   +/-   ##
============================================
  Coverage        21.88%   21.88%           
============================================
  Files              461      461           
  Lines             4830     4830           
  Branches             5        5           
============================================
  Hits              1057     1057           
  Misses            3771     3771           
  Partials             2        2           

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