"Queue up new tasks" equivalent in CLI / REST API

Description

Suggestion to add a new command in the CLI / REST API to reproduce the "Queue up new tasks" action that can be trigger within the web UI, with start_date and end_date parameters to allow running this action accross all dag runs lying a given period.

For the CLI, it could be airflow dags queue_up_new_tasks or airflow dags reload for instance.

Use case/motivation

Right now, when we add new tasks to an existing dag containing existing dag runs, it is not straightforward to run these newly added tasks in the existing/previous dag runs.

Two workarounds :

airflow dags backfill but not satisfying as it transforms "scheduled" existing dags run into "backfill" dag runs, which prevent us from interacting with them through the web UI (like clearing tasks, etc.)
airflow tasks render followed by airflow tasks clear but it is not convenient as the render command is only working for one specific execution_date (or run_id) at a time.

Or maybe there are already solutions par that ?

Are you willing to submit a PR?

[ ] Yes I am willing to submit a PR!

Code of Conduct

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apache / airflow