Set ValueSetRef.preserve to true for included value sets

[antvaset]

Closes #1407.

Starting with version 1.5, ValueSetRefs need to have preserve set to true during translation so that ValueSetRefEvaluator does not expand them during execution. Currently, this is only applied to the ValueSetRefs that point to value sets from the same library and not when the value set comes from an included library (i.e. not when ValueSetRefs are constructed from imported ValueSetDefs). The fix is to set ValueSetRef.preserve to true in both cases.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.73%. Comparing base (05c2bd3) to head (917ea2c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1409      +/-   ##
============================================
- Coverage     63.73%   63.73%   -0.01%     
- Complexity     2665     2666       +1     
============================================
  Files           494      494              
  Lines         27834    27836       +2     
  Branches       5527     5528       +1     
============================================
+ Hits          17740    17741       +1     
- Misses         7851     7852       +1     
  Partials       2243     2243              

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