Optimize whitespace in template by default (preserveWhitespace to false by default) #22027
Description
In #18401 we implemented preserveWhitespace compiler flag to fix #11679.
Initially we made this an opt-in because of a possibility of subtle breaking changes related to applying styles to DOM with whitespace suddenly stripped from most nodes.
Now that we verified that the negative impact of this change at Google has been minimal, we should go ahead and make https://github.com/angular/angular/issues/11679 option set to false by default.