[8.7] Fix unhandled exception when blobstore repository contains unexpected file (#93914) #93942
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… file (elastic#93914) If there's any file with the `index-` prefix but not a number after that at the repo root we must not throw here. If we do, we will end up throwing an unexpected exception that is not properly handled by `org.elasticsearch.snapshots.SnapshotsService#failAllListenersOnMasterFailOver`, leading to the repository generation not getting correctly set in the cluster state down the line.
original-brownbear added :Distributed Coordination/Snapshot/Restore 
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Backports the following commits to 8.7: