tarantool / tarantool / 19173565547 / 1

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raft: fix election deadlock when nodes have election_mode off

Forcing nodes with `is_enabled=false` to always broadcast
`is_leader_seen=false`. This allows candidate nodes to immediately clear
witness map bits for non-participating nodes, enabling elections to
proceed with only active participants.

Closes #12018

NO_DOC=bugfix

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