chore: delete _useIsProdHack

[wrt95]

Description

• Not in use so its deleted

Related Issue(s)

• Delete _useIsProdHack #13888

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.13%. Comparing base (bea682e) to head (94f321a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13939   +/-   ##
=======================================
  Coverage   95.13%   95.13%           
=======================================
  Files        1677     1677           
  Lines       22238    22238           
  Branches     2612     2612           
=======================================
  Hits        21157    21157           
  Misses        835      835           
  Partials      246      246           

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