Support experimental running gdk reconfigure automatically after a gdk update

What does this Merge Request do?

⚠ This MR requires !1282 (merged).

This MR offers the gdk.experimental.auto_reconfigure setting that runs gdk reconfigure after a successful gdk update.

Add the following to your gdk.yml:

gdk:
  experimental:
    auto_reconfigure: true

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.