AIP-38 Update TaskInstance and DagRun clearing process accordingly to AIP-66

[pierrejeambrun]

Body

This issue aims to update in the front-end how we do the clearing of task instances and dag runs. With AIP-66, clearing a task in the past doesn't really make sense. This is closer to a "rerun" feature and should create a new run for the same period.

Committer

• I acknowledge that I am a maintainer/committer of the Apache Airflow project.

[bbovenzi]

Closing for now since logical_date is still unique