fix(f3): send the last gpbft message for each new participant

[hanabi1224]

Summary of changes

This PR ports filecoin-project/lotus#12597 to avoid a deadlock situation where everyone is waiting for the next round to participate, but we'll never get there because not enough participants acted in the current round.

Changes introduced in this pull request:

Reference issue to close (if applicable)

Closes #4911

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

Now we're doing the porting like Venus! :D