fix(schematics): add app prefix to components

[amcdnl]

Adds the prefix to the generated components. Addresses #11525

[jelbourn]

Unless this is part of the Angular CLI's actual project schema, we can't add this extra property here without also making it non-enumerable because we reserialize this object and write it to disk when we're e.g. adding a theme.

[amcdnl]

Yes, this is in the actual schema. I pulled this code from official component schematic - https://github.com/angular/angular-cli/blob/master/packages/schematics/angular/component/index.ts#L116-L125

[jelbourn]

LGTM

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