Configure skip-test globally on angular.json is not working for service

Hi,

_CLI_

`ionic g service core/services/utils/storage `

_angular.json_

```
"@ionic/angular-toolkit:service": {
"skip-test": true
}
```

and tried this too:

```
"@ionic/angular-toolkit:service": {
"spec": false
}
```
But still above CLI generates `spec` file.

If I use this CLI then it works without `spec` file

`ionic g service core/services/utils/toast --skipTests=true`

So how to configure this feature globally using `angular.json`?

Ionic:

Ionic CLI : 6.9.2 (C:\Users\Sampath\AppData\Roaming\npm\node_modules\@ionic\cli)
Ionic Framework : @ionic/angular 5.3.3
@angular-devkit/build-angular : 0.1001.2
@angular-devkit/schematics : 10.0.8
@angular/cli : 10.1.2
@ionic/angular-toolkit : 2.3.3

Capacitor:

Capacitor CLI : 2.4.1
@capacitor/core : 2.4.1

Utility:

cordova-res : 0.14.0
native-run (update available: 0.3.0) : 0.2.5

System:

NodeJS : v12.13.1 (C:\Program Files\nodejs\node.exe)
npm : 6.12.1
OS : Windows 10

Reproduce the service-generation commands shown in the issue with the angular.json configurations and compare the generated files. Start from the Ionic CLI service generator and Angular schematics configuration handling; done means the global setting prevents the service spec file while the explicit skip-tests option continues to work.

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