Gantt: fix ts issues (all files except ui.gantt.js)

Author: pharret31

packages/devextreme/js/__internal/ui/gantt/gantt_importer.ts

@@ -1,11 +1,13 @@
-import Errors from '../widget/ui.errors';
+import errors from '@js/core/errors';
 import Gantt from 'devexpress-gantt';
 
-
+// eslint-disable-next-line @stylistic/max-len
+// eslint-disable-next-line @typescript-eslint/explicit-function-return-type,@typescript-eslint/explicit-module-boundary-types
 export function getGanttViewCore() {
-    if(!Gantt) {
-        throw Errors.Error('E1041', 'devexpress-gantt');
-    }
+  if (!Gantt) {
+    throw errors.Error('E1041', 'devexpress-gantt');
+  }
 
-    return Gantt;
+  // eslint-disable-next-line @typescript-eslint/no-unsafe-return
+  return Gantt;
 }