Revert "blockchain: detect and log bad difficulty calculations" #9688
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This reverts commit 5741b4d.
This change got introduced in #6544 with the goal to find a race condition in the difficulty code, it was found and fixed in #6650. Since then no issues have been found and 5 years have passed, it is time to revert it since it slows down the code.
Even after reverting this patch we still have a safeguard against race conditions with #6534.