Fix deleting index during snapshot finalization #104380
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Today if an index is deleted during a very specific order of snapshot finalizations then it's possible we'll miscalculate the latest shard generations for the shards in that index, causing the deletion of a shard-level `index-UUID` blob which prevents further snapshots of that shard. Backports elastic#103817 to 7.17 Closes elastic#101029
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Today if an index is deleted during a very specific order of snapshot
finalizations then it's possible we'll miscalculate the latest shard
generations for the shards in that index, causing the deletion of a
shard-level
index-UUIDblob which prevents further snapshots of thatshard.
Backports #103817 to 7.17
Closes #101029