Validating a default workflow task

Note that the form and validation are only done for the default parallel and serial workflow for now because we know the used variables and their type.

On the task view screen, display a simple form with all task variables.
Each variable is rendered as a simple input.
Add a specific comment input as it's not a variable.

At the end of the form, display a "Process" action that displays the task actions at the bottom, like other actions, to complete the task.

When the task is completed, display a toast message and navigate back to the task list (refreshing the list).