SDSTOR-25311: reset latch_lsn in become_leader_cb

[JacksonYao287]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (stable/v7.x@7c1d614). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/lib/replication/repl_dev/raft_repl_dev.cpp	0.00%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@              Coverage Diff               @@
##             stable/v7.x     #903   +/-   ##
==============================================
  Coverage               ?   48.29%           
==============================================
  Files                  ?      110           
  Lines                  ?    13114           
  Branches               ?     6323           
==============================================
  Hits                   ?     6334           
  Misses                 ?     2554           
  Partials               ?     4226           

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[Besroy]

LGTM