Manual tests of removing the second worker during running

[Kailai-Wang]

Context

Imagine both workers diverge like #1524
How can we recover from that, or at least allow one worker to continue working?

We should at least test the following:

• stop the second worker when it's still running
• see if worker0 continues working (I assume yes)
• observe the block production interval (I assume 2x the itp setting, as worker1 can't claim the slot now)
• can we modify the registry to reduce worker0's block interval to be the same as the itp setting? Or in general we need some extrinsics to be able to manually modify that

---

✔️ Please set appropriate labels and assignees if applicable.

[github-actions]

❗ This issue is stale because it has been open for 60 days with no activity.
Remove Stale label or update it, otherwise this issue will be closed in 7 days.
@litentry/parachain

[grumpygreenguy]

We added this as a scenario in CI (which we apparently need to disable because our multiworker setup just ain't working).

[kziemianek]

Completed in #2316