PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the [CLA].
• All existing tests are passing (previously they were stuck, now they are running again): https://github.com/NativeScript/nativescript-schematics/blob/master/CONTRIBUTING.md#running-tests.
• Tests for the changes are included.

What is the current behavior?

1. ng generate component was not taking into account the style extension configured in angular.json file
2. TypeScript version should be 4.1 instead of 4.0 to work with @schematics/angular@11.2
3. Migration to @schematics/angular@11.2 was partially done at angular-project-parser.ts file due to hidden any type errors.

What is the new behavior?

With this angular.json file:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "cli": {
    "defaultCollection": "@nativescript/schematics"
  },
  "projects": {
    "app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "Sym",
      "schematics": {
        "@schematics/angular:component": {
          "style": "scss"
        }
      }
    }
  },
  "defaultProject": "app"
}

In a NS project with TS 4.1.5, NS 7.3, and NG 11.2, it produces the following output:

I think I fixed other things along the way, e.g. tests are no longer "hanging" now.

Fixes/Implements/Closes regression induced in 3ff5fa7.

BREAKING CHANGES:
None, the API remains the same

Migration steps:
TypeScript v4.1.x should be installed