Load: Optimized the downgraded logic for tsFile to insert more data when tsFile corrupted

[Caideyipi]

Description

As the title said.

---

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

[luoluoyuyu]

Review summary

Introduces LoadTreeTsFileTabletIterator and uses it in LoadTreeStatementDataTypeConvertExecutionVisitor so corrupted TsFiles can yield more insertable tablets on downgrade. Adds unit tests for the converter path.

Please fix failing datanode unit tests before merge.

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

❌ Patch coverage is 84.81013% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.31%. Comparing base (a420681) to head (a3e00d5).
⚠️ Report is 104 commits behind head on master.

Files with missing lines	Patch %	Lines
...e/load/converter/LoadTreeTsFileTabletIterator.java	85.20%	37 Missing ⚠️
.../parser/query/TsFileInsertionEventQueryParser.java	76.31%	9 Missing ⚠️
...le/parser/scan/TsFileInsertionEventScanParser.java	92.30%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17674      +/-   ##
============================================
+ Coverage     40.87%   41.31%   +0.43%     
+ Complexity     2611      318    -2293     
============================================
  Files          5186     5273      +87     
  Lines        351308   368255   +16947     
  Branches      44971    47655    +2684     
============================================
+ Hits         143585   152131    +8546     
- Misses       207723   216124    +8401     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE