Basic validation and/or show more details about the provided pull-secret

[gbraad]

To prevent issues with the pull-secret, the component could perform basic validation.

When the pull secret has been pasted, it is checked for JSON-wellformedness. If not, the outer edge can turn red, and a callback can be given/variable set isValid = false;

It could even be possible to read basic data from the pull-secret. As the pull-secret takes the form of:

{
  "auths": {
    "cloud.openshift.com": {
      "auth": "b3B...Q==",
      "email": "gbraad@redhat.com"
    },
    "quay.io": {
      "auth": "b3B...Q==",
      "email": "gbraad@redhat.com"
    },
    "registry.connect.redhat.com": {
      "auth": "NTA...w==",
      "email": "gbraad@redhat.com"
    },
    "registry.redhat.io": {
      "auth": "NTA...w==",
      "email": "gbraad@redhat.com"
    }
  }
}

we could show:

Provided pull-secret belongs to:
Email:   g***d@r***t.com

Note: this could additionally state that the 'validness' (not expired) will be checked by the cluster.