Remove duplicate knowledge repository instance in the workflow library (

#2629)

* Refactor FhirOperator

* Change back to require

workflow/src/main/java/com/google/android/fhir/workflow/FhirOperator.kt

@@ -57,19 +57,23 @@ internal constructor(
   }
 
   private var dataRepo = FhirEngineRepository(fhirContext, fhirEngine)
-  private var contentRepo = KnowledgeRepository(fhirContext, knowledgeManager)
-  private var terminologyRepo = KnowledgeRepository(fhirContext, knowledgeManager)
+  private var knowledgeRepo = KnowledgeRepository(fhirContext, knowledgeManager)
+
+  // The knowledge manager is used for both content and terminology.
+  private val repository =
+    ProxyRepository(
+      /* data = */ dataRepo,
+      /* content = */ knowledgeRepo,
+      /* terminology = */ knowledgeRepo,
+    )
 
-  private val repository = ProxyRepository(dataRepo, contentRepo, terminologyRepo)
   private val evaluationSettings: EvaluationSettings = EvaluationSettings.getDefault()
-
   private val measureEvaluationOptions =
     MeasureEvaluationOptions().apply { evaluationSettings = this@FhirOperator.evaluationSettings }
 
   private val libraryProcessor = LibraryEngine(repository, evaluationSettings)
-
-  private val measureProcessor = R4MeasureProcessor(repository, measureEvaluationOptions)
   private val planDefinitionProcessor = PlanDefinitionProcessor(repository, evaluationSettings)
+  private val measureProcessor = R4MeasureProcessor(repository, measureEvaluationOptions)
 
   /**
    * The function evaluates a FHIR library against the database.