test: fix blockhash opcode related unit tests.

[lightscale-luke]

Issue Type

Others

OS Platform and Distribution

No response

Current Behaviour?

Currently `blockhash_gadget_simple` and `blockhash_gadget_large` unit tests are disabled.
The reason is that some of the cases of the tests passes but some don't.
Need to fix the unit tests for all of them to pass.

Standalone code to reproduce the issue

command to use run unit tests: 

cargo test --workspace --exclude integration-tests --exclude testool --exclude mock --exclude external-tracer --release -- --test-threads=4

### Relevant log output

_No response_