[8.18] Validate transport handshake from known version (#121802) #122010
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With parallel releases on multiple branches it's possible that an older branch sees a transport version update that is not known to a numerically newer but chronologically older version. In that case the two nodes cannot intercommunicate, so with this commit we reject such connection attempts at the version negotiation stage. Backport of elastic#121747 to 8.x
DaveCTurner
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:Core/Infra/Core
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Backports the following commits to 8.18: