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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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