Remove cleanup functions related to unchecked blocks. #4384
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Since the addition of the ascending bootstrapped, all unchecked blocks are held in memory and there is already a size limit on how many are kept in the container. Previously these blocks were stored on disk and the number of items was unbounded which necessitated periodic cleanup.
Cleaning the unchecked blocks could actually negatively affect the ascending bootstrapper and clobber critical blocks it needs causing the need to download them again.