RED-9375: fix component mapping endpoint validation

persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/service/ComponentMappingService.java

@@ -140,6 +140,10 @@ public class ComponentMappingService {
 
             columnLabels = rows.remove(0); // remove header row
 
+            if (Arrays.stream(columnLabels).distinct().count() < columnLabels.length) {
+                throw new BadRequestException("Column labels may not contain duplicates!");
+            }
+
             numberOfLines = (int) reader.getLinesRead() - 1; // subtract header row
 
             rows.sort(CSV_SORTER);