test(angular): validate checkbox and toggle in lazy template-form (#31005)

## What is the current behavior?
Checkbox and toggle components are not validated to be ticked/on in
`packages/angular/test/base/src/app/lazy/template-form`. This prevents
the error text from being displayed. While they have the `required`
attribute, this only applies to accessibility for
[checkbox](https://ionicframework.com/docs/api/checkbox#required) and
[toggle](https://ionicframework.com/docs/api/toggle#required).

## What is the new behavior?
- Use an Angular validator directive for checkbox and toggle.
- Make template-form an Angular module so the validator directive can be
imported.

## Does this introduce a breaking change?

- [ ] Yes
- [X] No