occasional incorrect block hash with TestValidatorStateMachine/MultipleBlockProposals

[jchappelow]

https://github.com/kwilteam/kwil-db/actions/runs/12240833385/job/34144591773#step:10:340

Rerun resolves. Something allows it to diverge randomly.

A related issue is that the block hash mismatch should cause the eventually to fail fast. We can use EventuallyWithT to have the test fail fast for some errors that are never going to change (and just keep iterating when conditions indicate it's just not there yet.

e.g.

	require.EventuallyWithT(t, func(c *assert.CollectT) {
		val, err := check(...)
		assert.NoError(c, err) // record error on c, this iteration did not succeed => keep trying
		require.Equal(t, val, 99) // fail on outer t, fail fase
	})

I might have that a little mixed up, but I think we can get fast failure behavior with this updated function. See stretchr/testify#1396 (comment) for more discussion.