DPE-3830 - (DONT MERGE) testing paxos single leader

[paulomach]

https://dev.mysql.com/doc/refman/8.0/en/group-replication-system-variables.html#sysvar_group_replication_paxos_single_leader

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.34%. Comparing base (e7c1809) to head (045d51c).
Report is 4 commits behind head on main.

❗ Current head 045d51c differs from pull request most recent head cfc6fb2. Consider uploading reports for the commit cfc6fb2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   66.25%   66.34%   +0.09%     
==========================================
  Files          17       17              
  Lines        3180     3153      -27     
  Branches      424      418       -6     
==========================================
- Hits         2107     2092      -15     
+ Misses        935      927       -8     
+ Partials      138      134       -4     

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