add yield leader api for test

[Besroy]

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[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.35%. Comparing base (1a0cef8) to head (4e8ddf7).
⚠️ Report is 264 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lib/replication/repl_dev/raft_repl_dev.cpp	0.00%	2 Missing ⚠️
src/lib/replication/repl_dev/solo_repl_dev.h	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #801      +/-   ##
==========================================
- Coverage   56.51%   55.35%   -1.17%     
==========================================
  Files         108      110       +2     
  Lines       10300    13248    +2948     
  Branches     1402     1929     +527     
==========================================
+ Hits         5821     7333    +1512     
- Misses       3894     5072    +1178     
- Partials      585      843     +258     

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