[INLONG-1563] Fix the bug which can't stop the heartbeat timer and make close can be called once

[TszKitLo40]

Signed-off-by: Zijie Lu wslzj40@gmail.com

Title Name: [INLONG-XYZ][component] Title of the pull request

where XYZ should be replaced by the actual issue number.

Fixes #1563

Motivation

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Modifications

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Verifying this change

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This change is a trivial rework / code cleanup without any test coverage.

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This change is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Documentation

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[codecov-commenter]

Codecov Report

Merging #1564 (cbfba0e) into INLONG-25 (758edd7) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             INLONG-25   #1564      +/-   ##
==============================================
- Coverage         7.51%   7.48%   -0.03%     
+ Complexity         479     478       -1     
==============================================
  Files              267     267              
  Lines            29500   29500              
  Branches          4843    4843              
==============================================
- Hits              2216    2208       -8     
- Misses           26810   26819       +9     
+ Partials           474     473       -1     

Impacted Files	Coverage Δ
.../java/org/apache/flume/sink/tubemq/TubemqSink.java	51.42% <0.00%> (-4.00%)	⬇️
.../producer/qltystats/DefaultBrokerRcvQltyStats.java	45.31% <0.00%> (-0.40%)	⬇️

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