engine-fhir tests improvements

[antvaset]

Two small changes:

• Enabling the FactorialOfFive test:
  Succeeds in checking ({ 1, 2, 3, 4, 5 }) Num aggregate Result starting 1: Result * Num = 120 with no changes needed.

• Fixing the expression logic for the RolledOutIntervals test and adding the expected output, but keeping the test skipped:
  For future reference, if you enable the test, you get an execution error Invalid precision: 1. This is because duration in days of X is interpreted as an integer which, when converted to a quantity, has unit '1' and not 'day'.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.27%. Comparing base (5d9ccd6) to head (be98a1d).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1368   +/-   ##
=========================================
  Coverage     62.27%   62.27%           
  Complexity     6952     6952           
=========================================
  Files           492      492           
  Lines         27727    27727           
  Branches       5506     5506           
=========================================
  Hits          17266    17266           
  Misses         8197     8197           
  Partials       2264     2264           

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