[IMP] project: take the actual task action instead of a dynamic one

Before this commit, we create a new dynamic action when creating a new
project.  This is a problem for various reasons:

- we did not have the nocontent helper properly set (so, the kanban view
  could not display the help message just after creating a project
- the dynamic action is slightly different from the one you get when you
  click on an existing project (different views, ...)
- the dynamic action is not editable in studio

With this commit, we simply reuse the same action, but with a different
context.  This solves all these issues at once, without duplicating
logic.

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