ENGCOM-6988: Improve dashboard charts - migrate to chart.js #26923

 - Merge Pull Request #26923 from Bartlomiejsz/magento2:feature/dashboards_charts
 - Merged commits:
   1. d00b206
   2. 5da031e
   3. d48cc2f
   4. e45bb96
   5. 820d3a4
   6. 2d63d4f
   7. c6f5f81
   8. f6d047a

Author: magento-engcom-team

dev/tests/integration/testsuite/Magento/Backend/Model/Dashboard/ChartTest.php

@@ -7,7 +7,6 @@
 
 namespace Magento\Backend\Model\Dashboard;
 
-use Magento\Backend\Model\Dashboard\Chart;
 use Magento\TestFramework\Helper\Bootstrap;
 use PHPUnit\Framework\TestCase;
 
@@ -62,7 +61,7 @@ public function getChartDataProvider(): array
                 'quantity'
             ],
             [
-                6,
+                19,
                 '1m',
                 'quantity'
             ],