optimization the registerDynamicThreadPool method of the DynamicThreadPoolConfigService class

[Dawanyezhi]

Changes proposed in this pull request:
Delete the duplicate subscription operation here, as the unified subscription change operation has been performed in the postProcessAfterInitialization method of the DynamicThreadPoolPostProcessor class. Keeping this will result in the duplicate registration of callback, causing the thread pool to execute the callback repeatedly when receiving configuration changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (265bf6e) 34.23% compared to head (ffcf698) 34.21%.
Report is 4 commits behind head on develop.

❗ Current head ffcf698 differs from pull request most recent head 83d9578. Consider uploading reports for the commit 83d9578 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1515      +/-   ##
=============================================
- Coverage      34.23%   34.21%   -0.02%     
+ Complexity       847      846       -1     
=============================================
  Files            262      262              
  Lines           5953     5953              
  Branches         560      560              
=============================================
- Hits            2038     2037       -1     
- Misses          3722     3723       +1     
  Partials         193      193              

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