Remove getByBlockNumber for CheckpointSync #5173
Merged
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Pull up and simplify data passed to CheckpointSource, which then allows checkpointBlockHeader to be used by protocolSchedule.getByBlockHeader.
Fixes #5167
Alternative approach explored: siladu@bbaa80d
but I didn't like the way ScheduleBasedHeaderBlockHeaderFunctions requires an explicit delegation override (otherwise it implicitly gets the wrong value).
CheckpointSync testing: