Remove epoch from CollectionGeneration

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      Currently the ChunkVersion which is the base of the entire shard versioning protocol relies on the CollectionGeneration which internally contains an epoch and a timestamp.

      SERVER-76486 made refineCollectionShardKey authoritative, effectively making all DDL timestamp changes inside of a critical section, which makes the timestamp a reliable source of causality, making it possible to remove the epoch from the CollectionGeneration.

            Assignee:
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            Reporter:
            Marcos José Grillo Ramirez
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              Created:
              Updated: