#1441: Fixes for Union

[JPercival]

• Fixed a bug where the fallback path for unions without result types was failing
• Added more tests for unions
• Engine still fails in cases where ambiguity exists when result types are absent, fixing that is a larger change in the engine.

[github-actions]

Formatting check succeeded!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.44%. Comparing base (79b699a) to head (3b55270).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ds/cqf/cql/engine/execution/EvaluationVisitor.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1480   +/-   ##
=========================================
  Coverage     64.43%   64.44%           
- Complexity     1936     1937    +1     
=========================================
  Files           494      494           
  Lines         28154    28154           
  Branches       5592     5592           
=========================================
+ Hits          18142    18143    +1     
+ Misses         7756     7755    -1     
  Partials       2256     2256           

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[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

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