Add a validate form boolean property on workflow node transition definition

• I create a workflow with content routing
• Into my route there is a form with required fields
• I want to create a validation button and a cancel button

Problem:

• Fields in the form are also required if the user click on cancel button

Solution ??

• Have the possibility to set immediate as true for the cancel button. Why don't we add a "validate form?" column after "Linked to transition".

See details in TL-282

Acceptance Criteria (note: generated config should be ui agnostic)

• A "validate form" column is available in workflow transitions, between condition and chain (chain options can lead to exiting the wf config, so we want to keep this at the end)
• Whenever I create a new transition, the validate form option is always true by default
• When I open the transitions tab for an existing workflow, the validate form option is true by default

• When the workflow engine only follow transitions where
  • the validate form option is enabled, the workflow task layout is validated (e.g. required fields are requested)
  • the validate form option is disabled, the workflow task layout is not validated (e.g. required fields are not requested)
• When the workflow engine follows transitions with conflicting validate form option values, the workflow task layout is validated (e.g. required fields are requested)