Split core proposals from bootstrap

[mhofman]

What is the Problem Being Solved?

Currently bootstrap serves 2 functions: setup the core vats needed for the basic functionality of a chain, and execute a set of core proposals.

#8287 introduces a way to run core proposals, that are part of an upgrade, to completion within the block.

Description of the Design

Use the "same block" queue introduced in #8287 to queue and process bootstrap core proposals instead of relying on the bootstrap code to run those. To satisfy #8162. it would require reporting success of these core proposals back to cosmic-swingset, but that is also needed for upgrades.

We also would likely want to leverage the improvements of #8219 wrt scheduling of core proposals.

Security Considerations

None

Scaling Considerations

None

Test Plan

TBD

Upgrade Considerations

None, this only affect newly bootstrapped chains, but does remove complexity from the bootstrap vat and consolidates logic with upgrades.