Mark blockhashes and scanobjects arguments as required, so the user receives
a clear help message when either is missing.
Added a new functional test for this use case.
Co-authored-by: stickies-v <stickies-v@users.noreply.github.com>
Add self.log.info(...) calls at the beginning of each test
in GetBlocksActivityTest.
This improves readability and provides debugging information
by logging the purpose of each test upon its correct
execution.
This is in preparation for the next commit, which adds a new test
with log info, and it would look inconsistent without this commit.
