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relay: fix sending raft requests with GROUP_DEFAULT id

Commit 7aac790ef3e28 ("relay: send raft requests with GROUP_DEFAULT id")
tried to send all raft rows with GROUP_DEFAULT id. However, relay didn't
know the version_id of the instance during initial JOIN, so raft state
was sent with GROUP_LOCAL id. The test didn't properly work.

This commit fixes relay by setting proper version_id during initial JOIN.
The test is also fully rewritten.

Follows up #10727

NO_DOC=bugfix
NO_CHANGELOG=<already present>

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