fix: XS + SES snapshots are deterministic (test)

[dckc]

It's not entirely clear how this got fixed, but it no longer fails.

fixes #2776

[dckc]

@kriskowal do me a favor and test this on a mac?

[warner]

Excellent.

We should maybe add a note about when the new test will need to be updated. I think any change in SES will require updating the hashes, also any change in the xsnap.js initialization code.

Also, this test is a bit awkward here in packages/solo/ .. I think we put it here because the snapStore was hard to build from somewhere else, but now that packages/swing-store has been consolidated, is that still true? Can we move it to packages/SwingSet/ or packages/xsnap?

[dckc]

... Can we move it to packages/SwingSet/ or packages/xsnap?

I think we can move it to SwingSet. It passed a local smoke test. Let's see if the ci bot agrees.

I'd rather not add a dependency from xsnap to swing-store, especially since I expect to migrate xsnap to endo before too much longer.