feat(watch): add interruptible tasks

[NicholasLYang]

Description

Adds the ability to annotate persistent tasks as interruptible. Fixes #8164.

NOTE: This does create change in behavior for watch mode where new changes will stop the current executing and start a new one. Previously, we waited for runs to finish, but now that persistent tasks can be interrupted, we can't do that since persistent tasks don't finish.

Testing Instructions

Added tests for ensuring that interruptible requires persistent, but otherwise you'll have to try this out manually since it's watch mode.

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[weyert]

NOTE: This does create change in behavior for watch mode where new changes will stop the current executing and start a new one. Previously, we waited for runs to finish, but now that persistent tasks can be interrupted, we can't do that since persistent tasks don't finish.

But only when interruptible is set to true otherwise the previous behaviour occurs?

[NicholasLYang]

No, the change is true for all tasks. I don't want to make too many special cases for watch mode execution

[chris-olszewski]

I believe this now allows for persistent tasks to only run after their deps run which has also been an ask (#8673). Should we advertise this/consider this when naming the config option?

[chris-olszewski]

This is awesome!

If we ever enable caching during watch I believe we need to verify that cache: false on interruptible tasks, but since that isn't possible now it's fine.

[JCMais]

Hmm, looks like the JSON schema was not updated with the new field added here.