fix(injector: builtin: net-http-client): treat 4XX as errors, not 5XXs

[eliottness]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #426   +/-   ##
=======================================
  Coverage        ?   63.95%           
=======================================
  Files           ?      181           
  Lines           ?    10956           
  Branches        ?        0           
=======================================
  Hits            ?     7007           
  Misses          ?     3426           
  Partials        ?      523           

Components	Coverage Δ
Generators	76.69% <ø> (?)
Instruments	73.41% <ø> (?)
Go Driver	80.16% <ø> (?)
Toolexec Driver	73.59% <ø> (?)
Aspects	78.57% <ø> (?)
Injector	77.13% <ø> (?)
Job Server	67.26% <ø> (?)
Integration Test Suite	57.58% <100.00%> (?)
Other	63.95% <100.00%> (?)

Files with missing lines	Coverage Δ
_integration-tests/tests/net_http/client_error.go	100.00% <100.00%> (ø)