Deprecate pipe and interceptor external utilities

[remscodes]

• Deprecate testPipeValues.
• Deprecate makeInterceptorSucceed and makeInterceptorFail.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fc61db6) 98.27% compared to head (32c4881) 98.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files          73       73           
  Lines         347      347           
  Branches       71       71           
=======================================
  Hits          341      341           
  Misses          6        6           

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