[Flaky-test] Make timeout of MultiStageBrokerRequestHandlerTest.testAllLeafStagesEmpty tests longer

[Jackie-Jiang]

Fix #18618

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.41%. Comparing base (15a4da0) to head (4209af3).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18619      +/-   ##
============================================
+ Coverage     64.36%   64.41%   +0.05%     
  Complexity     1137     1137              
============================================
  Files          3336     3337       +1     
  Lines        206108   206067      -41     
  Branches      32142    32127      -15     
============================================
+ Hits         132659   132736      +77     
+ Misses        62788    62696      -92     
+ Partials      10661    10635      -26     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (?)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-21	64.41% <ø> (+0.05%)	⬆️
temurin	64.41% <ø> (+0.05%)	⬆️
unittests	64.41% <ø> (+0.05%)	⬆️
unittests1	56.84% <ø> (+0.07%)	⬆️
unittests2	36.93% <ø> (+0.01%)	⬆️

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