Enable prevote in some raft scenarios

[cjen1-msft]

This PR enabled pre-vote in all the scenarios where it is trivial to do so - the scenario does not rely on elections, or it just requires an additional round of communication to pass the pre-vote step.

Additionally I've added a replacement for retire_backup (retire_backup_pre_vote) which mirrors the original until the test is blocked by pre-vote round.
I've also cleaned up the retire_backup scenario as there were a couple of places where using finer grained messaging made the flow easier to understand.

[Copilot]

Pull request overview

This PR enables pre-vote in Raft consensus test scenarios where it can be trivially integrated, improving test coverage for the pre-vote election safety mechanism. The changes primarily add pre-vote configuration and adjust test flows to account for the additional PreVoteCandidate state in the election process.

Key changes:

• Enables pre_vote_enabled,true in 14 existing test scenarios where elections are either not tested or require minimal adjustments
• Adds a new retire_backup_pre_vote test that demonstrates pre-vote prevents leadership disruption when a removed node reconnects
• Updates election-related tests with PreVoteCandidate state assertions and corresponding message dispatch sequences

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/raft_scenarios/suffix_collision.{1,2,3}	Enables pre-vote configuration
tests/raft_scenarios/soft_rollback	Explicitly disables pre-vote as test relies on specific rollback behavior; also corrects assertion from "Primary" to "Leader"
tests/raft_scenarios/rollback_safety	Enables pre-vote and adds PreVoteCandidate state transitions at three election points
tests/raft_scenarios/retire_one	Enables pre-vote configuration
tests/raft_scenarios/retire_backup_pre_vote	New test demonstrating that pre-vote prevents removed nodes from disrupting leadership
tests/raft_scenarios/replicate	Enables pre-vote configuration
tests/raft_scenarios/reelection	Enables pre-vote and updates election flow to check for PreVoteCandidate state
tests/raft_scenarios/reconnect	Enables pre-vote configuration
tests/raft_scenarios/reconfiguration	Enables pre-vote configuration
tests/raft_scenarios/multi_election	Enables pre-vote configuration
tests/raft_scenarios/liveness_through_conflict	Enables pre-vote and adds PreVoteCandidate state transition during election
tests/raft_scenarios/fancy_election.{1,2}	Enables pre-vote and updates election sequence with PreVoteCandidate checks
tests/raft_scenarios/election_while_reconfiguration	Enables pre-vote and comprehensively updates election flow during reconfiguration with PreVoteCandidate state transitions
tests/raft_scenarios/check_quorum	Enables pre-vote configuration
tests/raft_scenarios/append	Enables pre-vote configuration
tests/raft_scenarios/ackuracy	Enables pre-vote and adds PreVoteCandidate state transitions at three election points