contracts: Remove hardcoded test data

[Maddiaa0]

Currently rollup test data is hardcoded (generated from a test inside circuit_block_builder.test.ts). Update the testing framework to reflect changes make to the encoders / decoders automatically, rather than having to copy over hard coded testing data.

[LHerskind]

Think some of this was already addressed by #412 and some by #431. The sol test is essentially there (atm) just for making it quicker to update the code when new things are added.

[LHerskind]

Closing this because of above and #469