First check

• I added a descriptive title to this issue.
• I used the GitHub search to find a similar request and didn't find it.
• I searched the Prefect documentation for this feature.

Prefect Version

2.x

Describe the current behavior

Flows cannot be canceled externaly.

Describe the proposed behavior

Add a button to orion do cancel/abort a currently running flow. A similar option should be added to the cli.

• add an option to cancel a flow - SIGTERM
• add an option to abort a flow - SIGKILL

Example Use

No response

Additional context

Realted to:
https://discourse.prefect.io/t/how-do-i-stop-or-cancel-a-task-run/615