Make sure that relationship type index is created when using PBI

- create an integration test for arrow database import

Author: DarthMax

io/core/src/main/java/org/neo4j/gds/core/io/db/GraphStoreToDatabaseExporterConfig.java

@@ -107,7 +107,7 @@ default org.neo4j.internal.batchimport.Configuration toBatchImporterConfig() {
             exportConfig.writeConcurrency(),
             exportConfig.pageCacheMemory(),
             exportConfig.highIO(),
-            IndexConfig.DEFAULT.withLabelIndex()
+            IndexConfig.DEFAULT.withLabelIndex().withRelationshipTypeIndex()
         );
     }
 }

io/core/src/test/java/org/neo4j/gds/core/io/db/GraphStoreToDatabaseExporterConfigTest.java

@@ -43,6 +43,8 @@ void testToBatchImporterConfig() {
         assertThat(pbiConfig.pageCacheMemory()).isEqualTo(100_000L);
         assertThat(pbiConfig.highIO()).isTrue();
         assertThat(Neo4jProxy.writeConcurrency(pbiConfig)).isEqualTo(42);
+        assertThat(pbiConfig.indexConfig().createLabelIndex()).isTrue();
+        assertThat(pbiConfig.indexConfig().createRelationshipIndex()).isTrue();
     }
 
 }