HBASE-9208 ReplicationLogCleaner slow at large scale

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HBASE-9110 Meta region edits not recovered while migrating to 0.96.0

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HBASE-9110 Meta region edits not recovered while migrating to 0.96.0; REVERT

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HBASE-9110 Meta region edits not recovered while migrating to 0.96.0; PUT BACK

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HBASE-9379 Doc that localfs is not durable

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