`tns migrate` does not update @ngtools/webpack

[rosen-vladimirov]

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.0.0
• Cross-platform modules: 5.2.0
• Android Runtime: 5.2.0
• iOS Runtime: 5.2.0
• Plugin(s):

"dependencies": {
    "@angular/animations": "~7.2.0",
    "@angular/common": "~7.2.0",
    "@angular/compiler": "~7.2.0",
    "@angular/core": "~7.2.0",
    "@angular/forms": "~7.2.0",
    "@angular/http": "~7.2.0",
    "@angular/platform-browser": "~7.2.0",
    "@angular/platform-browser-dynamic": "~7.2.0",
    "@angular/router": "~7.2.0",
    "nativescript-angular": "~7.2.1",
    "nativescript-theme-core": "~1.0.4",
    "reflect-metadata": "~0.1.12",
    "rxjs": "~6.3.0",
    "tns-core-modules": "~5.2.0",
    "zone.js": "~0.8.26"
  },
  "devDependencies": {
    "@angular/compiler-cli": "~7.2.0",
    "@nativescript/schematics": "~0.5.0",
    "@ngtools/webpack": "~7.2.0",
    "nativescript-dev-typescript": "~0.8.0",
    "nativescript-dev-webpack": "~0.20.0"
  },

Describe the bug
After using tns migrate for a project with Angular 7, almost all of the dependencies are updated except @angular/compiler-cli and @ngtools/webpack. So trying to build/run the app fails with error:

ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.3.0 but 3.4.5 was found instead.

After applying workaround suggested in #4874, trying to run tns preview or tns build <platform> --env.aot fails with error:

ERROR in : Error: Cannot find module '@ngtools/webpack/src/utils'

To Reproduce

$ tns create myApp --template tns-template-hello-world-ng@5.2
$ cd myApp
$ tns migrate
$ npm i --save-dev @angular/compiler-cli@~8.0
$ tns preview
// Scan the QR Code - you'll see the error
$ tns prepare <platform> --env.aot # you'll see the error

Expected behavior
After migrate, the project should build successfully.

Additional context
WORKAROUND: npm i --save-dev @angular/compiler-cli@~8.0 @ngtools/webpack@~8.0