[1.15] Fix prepare timeout issue

[Lyndon-Li]

Fix issue #8485, add an accepted time so as to count the prepare timeout

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.00%. Comparing base (7d2110e) to head (d78947a).
Report is 2 commits behind head on release-1.15.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.15    #8496      +/-   ##
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+ Coverage         58.99%   59.00%   +0.01%     
================================================
  Files               367      367              
  Lines             38873    38877       +4     
================================================
+ Hits              22934    22941       +7     
+ Misses            14477    14475       -2     
+ Partials           1462     1461       -1     

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