Make additional changes in the QtCreator side required for QDS new project dialog

* We need to use the CheckBox field to set the checked state of fields
  (TargetQtVersion, Use as default project location).
* When the validation of the Project Name or Project Location fails, we
  need a way to be notified of what went wrong. We also need a way to
  force the project intro page to execute the validation of those fields
  whenever we need (i.e. when the user types into our QML TextField
  controls)

Also, add a warning on loading wizards: whenever a wizard.json file
cannot be parsed, we should issue a qWarning(), so that we can more
easily notice when something went wrong.

Task-number: QDS-4490
Change-Id: I7cfa61b4e43d731db9d0679e093e723d947b60c0
Reviewed-by: Alessandro Portale <[email protected]>
Reviewed-by: Qt CI Bot <[email protected]>

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