Remove duplicate tests from the Cql-based tests

[brynrhodes]

The engine currently contains testing libraries:

https://github.com/cqframework/clinical_quality_language/tree/master/Src/java/engine/src/test/resources/org/opencds/cqf/cql/engine/execution

However, many of these tests are duplicates of the tests in the engine-fhir project:

https://github.com/cqframework/clinical_quality_language/tree/master/Src/java/engine-fhir/src/test/resources/org/hl7/fhirpath/cql

To reduce overall maintenance, remove the tests from the CQL-based suite that are duplicates of the XML-based suite.