Fix changing the parent dag state on subdag clear

[zarrarrana]

Closes: #15374
This pull request follows #14776.

Clearing a subdag with Downstream+Recursive does not automatically set the state of the parent dag so that the downstream parent tasks can execute.

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[boring-cyborg]

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[zarrarrana]

@ashb @kaxil @turbaszek @XD-DENG
Can someone please approve the CI workflow?

[kaxil]

Done

[zarrarrana]

@ashb @kaxil please review.

[zarrarrana]

@kaxil @ashb
I accidently closed the PR, could you approve the CI workflow again.

[github-actions]

The PR most likely needs to run full matrix of tests because it modifies parts of the core of Airflow. However, committers might decide to merge it quickly and take the risk. If they don't merge it quickly - please rebase it to the latest master at your convenience, or amend the last commit of the PR, and push it with --force-with-lease.

[zarrarrana]

Hi @kaxil do you know what the next step is, it still says 1 workflow awaiting approval?

[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[yuqian90]

This PR fixed some issues but isn't a complete fix (there are other ways the cleared TaskInstance can involve multiple DAGs. See Cross-DAG Dependencies). I put up another PR some time ago which should fix the remaining issues as well as the issue this PR reported: #15382