fixing broken tests when dup role assingment changed to return 409 (#12184)

Author: stevenwinship

src/test/java/edu/harvard/iq/dataverse/api/DatasetsIT.java

@@ -299,7 +299,7 @@ public void testCreateDataset() {
         grantRole.prettyPrint();
         grantRole.then().assertThat()
                 .body("message", containsString(BundleUtil.getStringFromBundle("datasets.api.grant.role.assignee.has.role.error")))
-                .statusCode(FORBIDDEN.getStatusCode());
+                .statusCode(CONFLICT.getStatusCode());
 
         // Create another random user: 
 
@@ -2354,7 +2354,7 @@ private static void validateAssignExistingRole(String datasetPersistentId, Strin
         failedGrantPermission.prettyPrint();
         failedGrantPermission.then().assertThat()
                 .body("message", containsString(BundleUtil.getStringFromBundle("datasets.api.grant.role.assignee.has.role.error")))
-                .statusCode(FORBIDDEN.getStatusCode());
+                .statusCode(CONFLICT.getStatusCode());
     }
 
     @Test