Remove block_processor::flush function #4404
Merged
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The ::flush style functions have been disfavored as they're error and deadlock-prone. Depending on them in unit tests is problematic as their effect can change over time as components are added or removed from the node.
Removing the block_processor::flush function is done in 5 commits with increasing complexity and finally removing it from the legacy bootstrap processor as well its implementation in the final commit.