### Description

In Airflow UI. If we go to Browse --> DAG Runs, then DAG Runs view will be displayed.

Table contains a lot of insightful values likes DAG execution date, Start date, end date, Dag config etc

Request to add DAG duration column in the same table.
DAG Duration i.e. DAG end_date timestamp  - DAG start_date timestamp

### Use case/motivation

Analytics purpose of knowing DAG duration at all DAGs level. So that I can easily find out which DAG  have least and max duration.

### Related issues

Checked open issues. There aren't any

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/www/views.py
return check_dag_edit_acl_for_actions
class SlaMissModelView(AirflowModelView):
    """View to show SlaMiss table"""
    route_base = '/slamiss'
    datamodel = AirflowModelView.CustomSQLAInterface(SlaMiss)  
    class_permission_name = permissions.RESOURCE_SLA_MISS
    method_permission_name = {
        'list': 'read',
    }
    base_permissions = [
        permissions.ACTION_CAN_READ,
        permissions.ACTION_CAN_ACCESS_MENU,
    ]
    list_columns = ['dag_id', 'task_id', 'execution_date', 'email_sent', 'timestamp']
    label_columns = {
        'execution_date': 'Logical Date',
    }
    add_columns = ['dag_id', 'task_id', 'execution_date', 'email_sent', 'timestamp']
    edit_columns = ['dag_id', 'task_id', 'execution_date', 'email_sent', 'timestamp']
    search_columns = ['dag_id', 'task_id', 'email_sent', 'timestamp', 'execution_date']
    base_order = ('execution_date', 'desc')
    base_filters = [['dag_id', DagFilter, lambda: []]]
    formatters_columns = {
        'task_id': wwwutils.task_instance_link,
        'execution_date': wwwutils.datetime_f('execution_date'),
        'timestamp': wwwutils.datetime_f('timestamp'),
        'dag_id': wwwutils.dag_link,
    }
class XComModelView(AirflowModelView):
    """View to show records from XCom table"""