chore: Add OFREP ITs

[markphelps]

Fixes: #3325

• Adds basic ITs for OFREP single evaluation API
• Moves snapshot IT to use readonly data instead of creating data in the test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.39%. Comparing base (aa21195) to head (c79f24d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3338   +/-   ##
=======================================
  Coverage   64.39%   64.39%           
=======================================
  Files         172      172           
  Lines       13721    13721           
=======================================
  Hits         8836     8836           
  Misses       4207     4207           
  Partials      678      678           

Flag	Coverage Δ
unittests	64.39% <ø> (ø)

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[erka]

nice!