Enable pre-vote by default

[cjen1-msft]

This PR follows up on the previous pre-vote PRs to enable it by default.
This closes #7361

Todos

• flip bit
• fix broken trace validation
  • flip bit in driver
• fix broken tests
  • partitions test
  • force_become_primary

[Copilot]

Pull request overview

This PR enables pre-vote by default in the Raft consensus implementation. Pre-vote is a Raft optimization that prevents unnecessary term increases by requiring candidates to win a "pre-vote" before calling a real election. This improves cluster stability and reduces disruption from partitioned or out-of-date nodes attempting to become leaders.

Key changes:

• Flipped the default value for pre_vote_enabled from false to true in core state and test driver files
• Updated numerous test scenarios to handle the new pre-vote phase in elections
• Refactored partition tests to accommodate the more stable election behavior with pre-vote
• Moved and improved the force_become_primary utility function from e2e_operations.py to partitions_test.py

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/consensus/aft/impl/state.h	Changed default value of pre_vote_enabled from false to true
src/consensus/aft/test/driver.h	Updated test driver to enable pre-vote by default
src/consensus/aft/test/main.cpp	Added test assertions for pre-vote message exchanges
src/consensus/aft/test/committable_suffix.cpp	Updated tests to dispatch pre-vote messages before election messages
tests/raft_scenarios/*	Updated test scenarios to assert PreVoteCandidate state and add explicit pre-vote enable/disable flags
tests/partitions_test.py	Refactored partition tests; added force_become_primary function; updated expectations for pre-vote behavior; contains leftover debug literals
tests/infra/network.py	Enhanced wait_for_node_commit_sync to accept optional nodes parameter; changed view comparison from > to >=
tests/e2e_operations.py	Removed force_become_primary and run_ledger_chunk_bytes_check functions (moved to partitions_test.py)