The angular.io project uses Angular and CLI v9, which by default turns on Ivy mode. However, since ec4381dd4, we explicitly opt out of Ivy. This commit removes the `enabledIvy: false` configuration, thus allowing the default behavior of having Ivy on. NOTE: This commit only changes the angular.io projects. The docs examples need to be updated separately (first to Angular and CLI v9 and then to Ivy). PR Close #32923