Convert awaits in network and ibc vats to promise watcher

[iomekam]

What is the Problem Being Solved?

We've been working on making the network and IBC vats durable (#8721). Leftover work from this initiative is that we haven't made promises durable yet, which prevents us from truly being able to upgrade.

Description of the Design

As part of the vow(whenable) work, we've created promise watchers that are durable and can ensure that a promise is reconnected on upgrade. We need to go through the two vats and migrate any code awaiting on a Vow to use a watcher insead

open design questions:

• use the vow-capable E work-alike?
• convert all awaits? or are there short-lived ones that should not be converted?

Security Considerations

Scaling Considerations

Test Plan

• upgrade / restart the vats at many points in the state machine

Upgrade Considerations

Tasks

Preview Give feedback

1. Implement Vows for upgrade-tolerant promise behaviour #8906
   enhancement +1
   
2. Use Remote<T> to indicate tolerance of far types #9027
   enhancement +1
   

[dckc]

Following the upgrade-at-each-point-in-a-flow test pattern, I'm trying to do some testing work to establish where the finish line is. I don't yet have a test failing in a way that shows that we're not already there. :-/

test-net-ibc-upgrade.ts currently a06db4c, based on #8721

net-ibc-test-log.md

cc @michaelfig @gibson042 @turadg

[dckc]

Richard found a failing test!

• test(boot): Add pause functionality to the mock IBC server #8922