[Fix](query) Fix the calc logic of dispatch read time

[Beyyes]

Description

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This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods.
• added or updated version, license, or notice information
• added comments explaining the "why" and the intent of the code wherever would not be obvious
  for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold
  for code coverage.
• added integration tests.
• been tested in a test IoTDB cluster.

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Key changed/added classes (or packages if there are too many classes) in this PR

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 41.41%. Comparing base (d16b5ea) to head (f8057b3).

Files with missing lines	Patch %	Lines
...plan/scheduler/FragmentInstanceDispatcherImpl.java	0.00%	17 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev/1.3   #15061      +/-   ##
=============================================
- Coverage      41.42%   41.41%   -0.02%     
  Complexity       193      193              
=============================================
  Files           3545     3545              
  Lines         228172   228172              
  Branches       27288    27288              
=============================================
- Hits           94525    94487      -38     
- Misses        133647   133685      +38     

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