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replication: fix potential panic during upgrades (#17476)
If the authoritative region has been upgraded to a version of Nomad that has new replicated objects (such as ACL Auth Methods, ACL Binding Rules, etc.), the non-authoritative regions will start replicating those objects as soon as their leader is upgraded. If a server in the non-authoritative region is upgraded and then becomes the leader before all the other servers in the region have been upgraded, then it will attempt to write a Raft log entry that the followers don't understand. The followers will then panic. Add same the minimum version checks that we do for RPC writes to the leader's replication loop.
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```release-note:bug | ||
replication: Fix a potential panic when a non-authoritative region is upgraded and a server with the new version becomes the leader. | ||
``` |
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