Fix table-model Pipe batch isolation

[Caideyipi]

Description

Group table-model Pipe batch rows by database and table so permission checks, schema validation, and redirect metadata stay isolated per target table. Add support for redirect handling of Pipe-generated InsertRows statements and regression tests for mixed-table batches.

Tests

• mvn -pl iotdb-core/datanode -DskipTests compile (passed)
• Targeted test execution is blocked by a pre-existing local test-compile mismatch: PipeSchemaRegionSinkMetricsTest references Tag.PIPE while the resolved node-commons artifact does not expose it.

[codecov]

Codecov Report

❌ Patch coverage is 97.05882% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 42.33%. Comparing base (d130239) to head (158c11d).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...eryengine/plan/analyze/schema/SchemaValidator.java	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #18577    +/-   ##
==========================================
  Coverage     42.33%   42.33%            
  Complexity      414      414            
==========================================
  Files          5415     5424     +9     
  Lines        390725   391371   +646     
  Branches      51182    51258    +76     
==========================================
+ Hits         165416   165691   +275     
- Misses       225309   225680   +371     

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