ACP2E-1813: Scheduled import logs successful run despite the error

- implemented solution and adjusted existing unit tests

Author: aplapana

app/code/Magento/ImportExport/Model/Import.php

@@ -528,7 +528,8 @@ public function importSource()
                         $this->getErrorAggregator()->getInvalidRowsCount(),
                         $this->getErrorAggregator()->getErrorsCount()
                     ),
-                    __('The import was successful.'),
+                    $this->getForceImport() == '0' && $this->getErrorAggregator()->getErrorsCount() > 0 ?
+                        __('The import was not successful.') : __('The import was successful.'),
                 ]
             );
             $this->importHistoryModel->updateReport($this, true);

app/code/Magento/ImportExport/Test/Unit/Model/ImportTest.php

@@ -268,6 +268,7 @@ protected function setUp(): void
                     '_getEntityAdapter'
                 ]
             )
+            ->addMethods(['getForceImport'])
             ->getMock();
         $this->setPropertyValue($this->import, '_varDirectory', $this->_varDirectory);
     }
@@ -302,6 +303,8 @@ public function testImportSource()
         $this->import->expects($this->any())
             ->method('_getEntityAdapter')
             ->willReturn($this->_entityAdapter);
+        $this->import->expects($this->once())
+            ->method('getForceImport');
         $this->_importConfig
             ->expects($this->any())
             ->method('getEntities')