test(connector-besu): migrate get-block-endpoint test cases from Tap to Jest

[krriscode]

Migrate all existing test cases for the get block endpoint to Jest

[krriscode]

Hi @petermetz,
requesting you to assign this issue, as we have discussed in one of the meet.

[petermetz]

@krriscode All yours! Thank you very much for the contributions in advance!

These are the test cases to be exact:

1. packages/cactus-test-plugin-ledger-connector-besu/src/test/typescript/integration/plugin-validator-besu/get-block-endpoint.test.ts
2. packages/cactus-test-plugin-ledger-connector-besu/src/test/typescript/integration/plugin-validator-besu/get-block-endpoint.test.ts