[Pipe] Fix omitted legacy tablet compatibility follow-ups

[Caideyipi]

This PR cherry-picks follow-up fixes for legacy compatibility that were missed in the previous legacy fix.

It adds legacy 1.3.x tablet batch binary request handling, hardens tablet deserialization validation/error context, and adds coverage for legacy single-column/truncated tablet cases.

Tests:

• Attempted .\mvnw.cmd -pl iotdb-core/datanode -Dtest=PipeDataNodeThriftRequestTest -DskipITs -Dspotless.check.skip=true test, but single-module compile missed reactor dependencies.
• Attempted .\mvnw.cmd -pl iotdb-core/datanode -am -Dtest=PipeDataNodeThriftRequestTest -DskipITs -Dspotless.check.skip=true -Dsurefire.failIfNoSpecifiedTests=false test, but local generated thrift compile failed because javax.annotation is unavailable.

[sonarqubecloud]

Quality Gate failed

Failed conditions
9.2% Duplication on New Code (required ≤ 5%)

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 56.63717% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.04%. Comparing base (aec7dfb) to head (e9f3c85).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../evolvable/request/PipeTransferTabletBatchReq.java	51.72%	28 Missing ⚠️
...db/db/pipe/sink/util/TabletStatementConverter.java	61.70%	18 Missing ⚠️
...ad/evolvable/request/PipeTransferTabletRawReq.java	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #17929   +/-   ##
=========================================
  Coverage     41.04%   41.04%           
  Complexity      318      318           
=========================================
  Files          5252     5252           
  Lines        364388   364474   +86     
  Branches      47096    47115   +19     
=========================================
+ Hits         149551   149604   +53     
- Misses       214837   214870   +33     

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