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Truncate tlog cli should assign global checkpoint (#28192)
We are targeting to always have a safe index once the recovery is done. This invariant does not hold if the translog is manually truncated by users because the truncate translog cli resets the global checkpoint to unassigned. This commit assigns the global checkpoint to the max_seqno of the last commit when truncating translog. We can only safely do it because the truncate translog command will generate a new history uuid for that shard. With a new history UUID, sequence-based recovery between that shard and other old shards will be disabled. Relates #28181
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