Use the Prettier transform for all subgens

[PierreBesson]

Overview of the feature request

Following this PR #9281 from @Fydon, we have prettierisation of YAML files for the main generator.

I'm proposing to add this transform to all our subgens and especially for the Kubernetes related subgens which use a lot of YAML. The v6 release is a good time to do this.

However there is something to be aware of : this will change the indentation style for lists. Currently with the Kubernetes subgen, our lists are indented like this :

spec:
  containers:
  - name: app

With prettier, it will be indented like this :

spec:
  containers:
    - name: app

Motivation for or Use Case

• Not having to think too much about formating of the templates
• Being able to catch invalid YAML in CI and suggest a fix

[cbornet]

In that case we should match the prettier style when generating the kube yaml.

[PierreBesson]

So apparently there was a vote on prettier/prettier#4723 and the behavior cannot be configured for now. The indented version looks fine for me and I think it's good to enforce conventions automatically.