VReplication: Remove noisy logs

[rohit-nayak-ps]

Description

It has been reported that some logs around the LastError module were spamming the consolidated logs when streaming from a large cluster (say 256 shards). This PR removes the noisy log lines and which don't add much value.

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Documentation was added or is not required

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[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.47%. Comparing base (9911880) to head (be6d6a8).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15987      +/-   ##
==========================================
+ Coverage   68.45%   68.47%   +0.02%     
==========================================
  Files        1562     1562              
  Lines      197057   197079      +22     
==========================================
+ Hits       134891   134953      +62     
+ Misses      62166    62126      -40     

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[mattlord]

Thanks! I actually noticed this noisy logging recently as well when doing local testing on #15797