fix(@schematics/angular): fixes issue that viewEncapsulation is not…

[alan-agius4]

… set in app.component.ts and in angular.json

Fixes #13689

[kekel87]

I think it should also add the option in the angular.json file :

"schematics": {
  "@schematics/angular:component": {
    "viewEncapsulation": "ShadowDom"
  }
},

For other generated components.

[alan-agius4]

@kekel87, yeah make sense.

[alan-agius4]

@clydin, or should we set defaultEncapsulation inside the main.ts?

[clydin]

At the application level, I think it would make more sense as a bootstrap option

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