[fix][test] Fix DeadLetterTopicTest.testDeadLetterTopicWithInitialSubscriptionAndMultiConsumers

[ZhaoGuorui666]

Fixes #23542

Motivation

The original receiverQueueSize was 100, and the producer generated a total of 100 messages. It is possible that all messages were put into the dead letter queue by one consumer, resulting in assertion failure.

Modifications

Reduce the size of the receiverQueueSize to ensure that every consumer processes the message.

receiverQueueSize ：100 -> 20

Verifying this change

The last test was manually cancelled.

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[lhotari]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.27%. Comparing base (bbc6224) to head (e7dfcbf).
Report is 716 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23552      +/-   ##
============================================
+ Coverage     73.57%   74.27%   +0.70%     
- Complexity    32624    34316    +1692     
============================================
  Files          1877     1943      +66     
  Lines        139502   147050    +7548     
  Branches      15299    16209     +910     
============================================
+ Hits         102638   109223    +6585     
- Misses        28908    29386     +478     
- Partials       7956     8441     +485     

Flag	Coverage Δ
inttests	27.31% <ø> (+2.73%)	⬆️
systests	24.35% <ø> (+0.03%)	⬆️
unittests	73.65% <ø> (+0.81%)	⬆️

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