add ower to TaskInstance class

[wornjs]

Description

add task owner information to taskinstance

Use case/motivation

I am sending an alarm to Slack using the airflow callback(on_success_callback, on_failure_callback) function.

I create an alarm message using the information of the task instance, and it would be better if the task owner information is included here.

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[boring-cyborg]

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