Deduplicate Index Meta Generations when Deserializing (#65619) #65666
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These strings are quite long individually and will be repeated
potentially up to the number of snapshots in the repository times.
Since these make up more than half of the size of the repository metadata
and are likely the same for all snapshots the savings from deduplicating them
can make up for more than half the size of
RepositoryDataeasily in most real-worldcases.
backport of #65619