[placeholder] Deprecate tasks with no type

[tcompa]

This is a placeholder. Actual deprecation requires a double check of what is the current situation on existing instances, and of which packages still do not use fractal-task-tools.

Notably we should not have

fractal-server/fractal_server/app/schemas/v2/task.py

Lines 76 to 91 in e0e8efc

	@model_validator(mode="after")
	def set_task_type(self):
	if self.type is None:
	logger.warning(
	f"Task type is not set for task '{self.name}', "
	"which will be deprecated in a future version. "
	"Please move to `fractal-task-tools`."
	)
	if self.command_non_parallel is None:
	self.type = TaskType.PARALLEL
	elif self.command_parallel is None:
	self.type = TaskType.NON_PARALLEL
	else:
	self.type = TaskType.COMPOUND
	return self