Fix vila it and drop `blocks`

[cmwilhelm]

I would like to redeploy vila with some new performance modifications. This PR does two things:

1. Removes the requirements for blocks from the request payload. We don't actually use them, since we are using ivila. This will save us unnecessary, expensive boxgroup annotation time.
2. Updates the test fixtures to use the newer box json serialization, since this was out of date. (values otherwise unchanged)

[geli-gel]

this whole time i thought vila annotated the blocks

[cmwilhelm]

@geli-gel the blocks are used by the hvila variant, which we decided not to use lololol.