Backport release/v6.7: retain 72 FlatKV checkpoints instead of mirroring memIAVL's count - #4146

Backport release/v6.7: retain 72 FlatKV checkpoints instead of mirroring memIAVL's count#4146

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release/v6.7sei-protocol/sei-chain:release/v6.7from

yiren/flatkv-checkpoint-retention-v67sei-protocol/sei-chain:yiren/flatkv-checkpoint-retention-v67Copy head branch name to clipboard