[FEATURE] Checkbox for confirmation in FormWizard

Adds an extra BEHAVIOUR section to form tab with a
checkbox to control whether the confirmation page
should be shown.

Change-Id: Id58ad0f8fa7fbbd5470e9a87e5fe31098b777a13
Resolves: #28628
Releases: 6.1
Reviewed-on: https://review.typo3.org/9136
Reviewed-by: Wouter Wolters
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn