[To dev/1.3] Fix flaky LastFlushTimeMapTest & Fix go client CI for dev/1.3

[HTHou]

Description

cherry-pick #14225

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.38%. Comparing base (f6b0cf9) to head (e256c93).
Report is 5 commits behind head on dev/1.3.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev/1.3   #14403      +/-   ##
=============================================
+ Coverage      41.37%   41.38%   +0.01%     
  Complexity       185      185              
=============================================
  Files           3505     3505              
  Lines         224349   224391      +42     
  Branches       26680    26686       +6     
=============================================
+ Hits           92820    92863      +43     
+ Misses        131529   131528       -1     

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