**Description**

It would be nice if the weight_rule default value could be managed by a global config

suggested config:
```
# Weighting method used for the effective total priority weight of the task. 
# Options are: { downstream | upstream | absolute } default is
default_weight_rule = downstream
```
**Use case / motivation**

In some pipeline, you really need to have absolute weight, and then you have to add a line in each task definition which is annoying

airflow/models/baseoperator.py
self,
        start_date: Optional[datetime] = None,
        end_date: Optional[datetime] = None,
        ignore_first_depends_on_past: bool = True,
        ignore_ti_state: bool = False,
        mark_success: bool = False,
        test_mode: bool = False,
        session: Session = None,
    ) -> None:
        """Run a set of task instances for a date range."""
        from airflow.models import DagRun
        from airflow.utils.types import DagRunType
        start_date = start_date or self.start_date
        end_date = end_date or self.end_date or timezone.utcnow()
        for info in self.dag.iter_dagrun_infos_between(start_date, end_date, align=False):
            ignore_depends_on_past = info.logical_date == start_date and ignore_first_depends_on_past
            try: