Pipe: Remove Ratis data region source restriction

[Caideyipi]

Summary

• Remove the data region source validation that rejects pipe insertion extraction when data regions use Ratis consensus.
• Drop the now-unused i18n message.

Tests

• mvn spotless:apply -pl iotdb-core/datanode
• mvn compile -pl iotdb-core/datanode (fails: existing generated thrift/antlr/API mismatch, e.g. missing TShowRepairDataPartitionTableProgressResp and parser contexts)

[sonarqubecloud]

Quality Gate passed

Issues
0 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.52%. Comparing base (220e7a3) to head (30d9096).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18089      +/-   ##
============================================
- Coverage     41.65%   41.52%   -0.14%     
  Complexity      318      318              
============================================
  Files          5296     5296              
  Lines        371663   371657       -6     
  Branches      48088    48086       -2     
============================================
- Hits         154819   154326     -493     
- Misses       216844   217331     +487     

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