Generated proof data should retain its pattern

[schemar]

Story

As a developer
I want to know which pattern caused an MPP library test to fail
Because it helps me debug the case

Scenario

Given that I run the MPP.verify unit tests
When a test based on the data from the fuzzy proof generator fails
Then the message should include the pattern
Instead it currently only contains the arguments to verify

Info

TODO: When generating and storing the proof data with the fuzzy generator in ./tools/fuzzy_proof_generator_tool/generate.ts, also store the pattern that was used to generate the proof in the generated JSON file.

That should be all, as the assert message in ./test/lib/merkle_patricia_proof.js already contains data, which now contains the pattern.

ℹ️ This is a follow-up to #743 and #751