Description of problem:

As part of the Graceful Pipeline Run termination upstream PR, we now have two more new statuses "StoppedRunFinally" and "CancelledRunFinally" for interrupting a running pipeline.

StoppedRunFinally - To "stop" (i.e. let the tasks complete, then execute finally tasks) a Pipeline

CancelledRunFinally - To "cancel" (i.e. interrupt any executing non finally tasks, then execute finally tasks)

Prerequisites (if any, like setup, operators/versions):

High chances for this to be available in OSP 1.5

Additional info:

This change is included in upstream 0.25.0
https://github.com/tektoncd/pipeline/releases/tag/v0.25.0

Original slack conversation - https://coreos.slack.com/archives/CHG0KRB7G/p1623405117043300