feat(upgrade): export VERSION from upgrade/static (#14037)

PR Close #14037

modules/@angular/upgrade/static.ts

@@ -14,6 +14,7 @@
  */
 export {downgradeComponent} from './src/common/downgrade_component';
 export {downgradeInjectable} from './src/common/downgrade_injectable';
+export {VERSION} from './src/common/version';
 export {UpgradeComponent} from './src/static/upgrade_component';
 export {UpgradeModule} from './src/static/upgrade_module';