Modify MMR sync algorithm. #3025
Merged
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This PR modifies MMR-sync algorithm during its integration in the domain snap sync.
The main change is introducing the target block from which we sync the MMR data, we need this to reflect the fact that we synchronize only MMR data for finalized blocks and there is a lag between archived (accessible via snap-sync) and finalized blocks (MMR-data) in 5 segments of blocks. Additional change was improved error handling.
Relates to #3026
Code contributor checklist: