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replication: update raft instance id on anon replica register

The raft subsystem has its own copy of an instance id, raft::self. It's
set during initial `box.cfg()` call, after local recovery or bootstrap.

It was forgotten to update raft::self after an anonymous replica
register. This could lead to various assertion failures in raft code in
debug build, and in the release build the raft state would be silently
corrupted. Fix this.

Closes #11938

NO_DOC=bugfix

(cherry picked from commit a4d038dcd)

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