Now `@experimental` tags are banned; and `@publicApi` tags are required on exports. PR Close #26595
Also use it to test the public API for core and common Once we have an ng_package for every package, we can remove the npm dependency on ts-api-guardian and the gulp-based public api check. PR Close #22544
This is an exact mirror of 750f651eca PR Close #22544
750f651eca