convert: Wait for writes to complete before turning candidate

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (0162e44) 74.01% compared to head (4d9a9fc) 74.03%.

Files	Patch %	Lines
src/replication.c	66.66%	1 Missing and 1 partial :warning:
src/legacy.c	66.66%	0 Missing and 1 partial :warning:
src/raft.c	83.33%	0 Missing and 1 partial :warning:
src/timeout.c	92.30%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #165 +/- ## ========================================== + Coverage 74.01% 74.03% +0.01% ========================================== Files 52 52 Lines 10350 10356 +6 Branches 2479 2482 +3 ========================================== + Hits 7661 7667 +6 - Misses 1318 1320 +2 + Partials 1371 1369 -2 ```

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