Improve productivity of test_civc_standalone_vks_havent_changed

[ludamad]

If our precomputed vk check fails (called thru bb cli) we should likely leave an updated version of the ivc-inputs.msgpack that DOES match. with an --update-fast script mode, we should update each vk in the file, such that we can simply reupload with the correct ivc-inputs.msgpack's. This would save a lot of time

[ludamad]

the benefit of this is we wouldn't need to bootstrap outside of barretenberg

[johnathan79717]

It seems that we check the precomputed vk's here. So if the precomputed vk check fails, we can update the vk and use the compress_and_save function to output the file. Strangely, I didn't see the compress_and_save function used anywhere.

[ludamad]

With --update_fast, I consider it as done as it ever will be.