feat(@schematics/angular): cli app redesign

[filipesilva]

Followup to #14403 with tests fixed.

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[alexeagle]

@mgechev this can merge, the size increase is expected since the initial app after ng new is richer

[IgorMinar]

this is now obsolete due to updates in the original #14403 (the changes in this PR were cherry-picked)

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