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**Description**

Related to the discussion here: https://github.com/apache/airflow/pull/8553#discussion_r416136954

Allow user to define expected terminal state. e.g. `JOB_STATE_CANCELLED` could be not treated as failure but expected terminal state.


<!-- A short description of your feature -->


def set_current_job(current_job):
            self.job = current_job
            DataflowJobLink.persist(self, context, self.project_id, self.location, self.job.get("id"))
        options = self.dataflow_default_options
        options.update(self.options)
        self.job = self.hook.start_template_dataflow(
            job_name=self.job_name,
            variables=options,
            parameters=self.parameters,
            dataflow_template=self.template,
            on_new_job_callback=set_current_job,
            project_id=self.project_id,
            location=self.location,
            environment=self.environment,
            append_job_name=self.append_job_name,
        )
        job_id = self.job.get("id")
        if job_id is None:
            raise AirflowException(
                "While reading job object after template execution error occurred. Job object has no id."
            )
        if not self.deferrable:
            return job_id
        context["ti"].xcom_push(key="job_id", value=job_id)
        self.defer(