TF-4136 refactor(logging): replace logError with logWarning for non-critical cases

integration_test/mixin/scenario_utils_mixin.dart

@@ -207,7 +207,7 @@ mixin ScenarioUtilsMixin {
           attachments.add(attachment);
         }
       } catch (e) {
-        logError('ScenarioUtilsMixin::uploadAttachments(): $e');
+        logWarning('ScenarioUtilsMixin::uploadAttachments(): $e');
         return attachments;
       }
     }