[fix][test] flaky test: testOnlyCloseActiveConsumerForSingleActiveConsumerDispatcherWhenSeek

[labuladong]

Fixes #19535

Modifications

Original code only guarantee one consumer reconnected, the other consumer may not finish reconnecting, so there is only one consumer in subscription. Now use Awaitility to guarantee two consumers reconnected.

Verifying this change

• Make sure that the change passes the CI checks.

Documentation

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

[github-actions]

@labuladong Please add the following content to your PR description and select a checkbox:

- [ ] `doc` <!-- Your PR contains doc changes -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update later -->
- [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
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[Technoboy-]

/pulsarbot rerun-failure-checks

[Technoboy-]

/pulsarbot rerun-failure-checks

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.07%. Comparing base (e0b50c9) to head (deeae18).
⚠️ Report is 2814 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #19572       +/-   ##
=============================================
+ Coverage     24.65%   62.07%   +37.41%     
- Complexity      291     3491     +3200     
=============================================
  Files          1591     1844      +253     
  Lines        123073   135280    +12207     
  Branches      13434    14875     +1441     
=============================================
+ Hits          30348    83972    +53624     
+ Misses        88233    43582    -44651     
- Partials       4492     7726     +3234     

Flag	Coverage Δ
inttests	24.67% <ø> (+0.01%)	⬆️
systests	25.28% <ø> (?)
unittests	59.23% <ø> (?)

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see 1378 files with indirect coverage changes

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