Feature flags: Sync enabled feature flags differently on virgin node #6791
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If a virgin node starts as clustered (thanks to peer discovery), we need to mark feature flags already enabled remotely as enabled locally too.
We can't do a regular cluster sync because remote nodes may have required feature flags which are disabled locally on the virgin node. Therefore, those nodes don't have the migration code for these feature flags anymore and the feature flags' state can't be changed.
By doing this special sync, we allow a clustered virgin node to join a cluster with remote nodes having required feature flags.