Replace external_trigger check with DagRunType

[kaxil]

Now that we have explicit Dag Run types, we should not need DagRun.external_trigger too.

Example, the following code can be changed

airflow/providers/src/airflow/providers/standard/operators/latest_only.py

Lines 52 to 58 in 49581b3

	def choose_branch(self, context: Context) -> str | Iterable[str]:
	# If the DAG Run is externally triggered, then return without
	# skipping downstream tasks
	dag_run: DagRun = context["dag_run"] # type: ignore[assignment]
	if dag_run.external_trigger:
	self.log.info("Externally triggered DAG_Run: allowing execution to proceed.")
	return list(context["task"].get_direct_relative_ids(upstream=False))

to

    def choose_branch(self, context: Context) -> str | Iterable[str]:
        # If the DAG Run is manually triggered, then return without
        # skipping downstream tasks
        dag_run: DagRun = context["dag_run"]  # type: ignore[assignment]
        if dag_run.run_type == DagRunType.MANUAL:
            self.log.info("Externally triggered DAG_Run: allowing execution to proceed.")
            return list(context["task"].get_direct_relative_ids(upstream=False))

We should replace all usages of DagRun.external_trigger and remove it from DB too.

[jason810496]

Hi @kaxil, I can work on this issue, could you assign to me ? Thanks !

[kaxil]

Awesome, assigned it to you