Add stricter files inclusions for newly generated VE apps (V9)

[alan-agius4]

🚀 Feature request

With this PR #15030 we introduces a stricter inclusion of files in the TS compilations for Ivy.

In version 8 we decided that we shouldn't do it for VE since this will break new VE app which will use the deprecated string based lazy loading, as users will need to add the lazy loaded modules in the list of files to include.

In version 9, we should always apply the stricter files inclusion for all newly generated projects.

Files to be updated

packages/schematics/angular/application/files/tsconfig.app.json.template
tests/angular_devkit/build_angular/hello-world-app/src/tsconfig.app.json

[alan-agius4]

We should also probably enable the warning for unused files for VE that was introduction in #15061

[alan-agius4]

Addressed in #15469

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