[Merged by Bors] - optimistic filtering: add two more conditions #3741
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Motivation
Closes #3378
Changes
add two more conditions for enabling optimistic filtering for layer N
these conditions are added to miner prior to recording its mesh hash for layer N-1 in its proposal.
note: this is done at proposal creation time instead of block creation time to prevent nodes from making different decisions on whether to do optimistic filtering and causing multiple blocks created for the same layer.