fix(@schematics/angular): remove test build options from angular.json if skipTests is passed

[sp90]

PR Checklist

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• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

I often feel that skipTests add a lot of code that is unessary for non test applications and could probably benefit from adding it if there are added tests later on

What is the current behavior?

ng new newApp --skip-tests it only skip .spec.ts

Issue Number: N/A

What is the new behavior?

It does also skip the angular.json build configuration for tests

Does this PR introduce a breaking change?

• Yes
• No

Other information

I think this could be a first PR in a series of PR's where we go towards having skip-tests applied by default to reduce boilerplate of a base angular app.

And then i think we should later on create scripts/packages like ng add @angular/test/jest or ng add @angular/e2e/playwright

This also aligns perfectly with making rxjs optional and having angular/ssr as an optional part of angular

[sp90]

Just fixed with squash of the previous commit to simplify git history

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