Extend region migration speed limit to transfers and deletion

[CRZbulabula]

Summary

• Extend region_migration_speed_limit_bytes_per_second to throttle region migration transfer across consensus protocols that have real transfer paths.
• Keep IoTConsensus AddPeer snapshot transfer covered by the shared limiter, and add coverage for IoTConsensusV2 consensus pipe transfer and Ratis install snapshot transfer.
• Share the same limiter with region file deletion and wire DataRegion, SchemaRegion, WAL, snapshot, and consensus peer cleanup paths through rate-limited deletion helpers.
• Update the config template description and add unit coverage for rate-limited deletion, IoTConsensusV2 transfer size calculation, and Ratis snapshot chunk size calculation.

Protocol coverage

• IoTConsensus: AddPeer snapshot transfer is rate-limited.
• IoTConsensusV2: tablet, tablet batch, delete event, and TsFile piece transfer requests are rate-limited.
• Ratis: install snapshot file chunks are rate-limited before sending.
• SimpleConsensus: no remote region migration transfer path; local region deletion cleanup remains rate-limited.

Tests

• mvn spotless:apply -pl iotdb-core/node-commons,iotdb-core/consensus,iotdb-core/datanode
• mvn test -pl iotdb-core/node-commons -am -Dtest=FileUtilsTest -DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false
• mvn test -pl iotdb-core/consensus -am -Dtest=RateLimitedGrpcLogAppenderTest -DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false
• mvn test -pl iotdb-core/datanode -am -Dtest=IoTConsensusV2RateLimiterTest -DfailIfNoTests=false -Dsurefire.failIfNoSpecifiedTests=false
• mvn compile -pl iotdb-core/consensus,iotdb-core/datanode -am -DskipTests
• mvn test-compile -DskipTests -P with-zh-locale -pl iotdb-core/consensus,iotdb-core/datanode -am

Note: full reactor mvn test-compile -DskipTests reaches the distribution module and fails to resolve existing 2.0.11-SNAPSHOT zip artifacts for iotdb-server, iotdb-cli, and iotdb-confignode. The changed modules compile successfully.

[codecov]

Codecov Report

❌ Patch coverage is 63.55932% with 43 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.73%. Comparing base (8940ba0) to head (801d4fb).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...rotocol/iotconsensusv2/IoTConsensusV2SyncSink.java	0.00%	14 Missing ⚠️
...ocol/iotconsensusv2/IoTConsensusV2RateLimiter.java	69.23%	4 Missing ⚠️
...b/schemaengine/schemaregion/SchemaRegionUtils.java	0.00%	4 Missing ⚠️
...java/org/apache/iotdb/commons/utils/FileUtils.java	71.42%	4 Missing ⚠️
...otdb/commons/utils/RegionMigrationRateLimiter.java	81.25%	3 Missing ⚠️
...rg/apache/iotdb/consensus/pipe/IoTConsensusV2.java	0.00%	2 Missing ⚠️
...gine/schemaregion/impl/SchemaRegionMemoryImpl.java	0.00%	2 Missing ⚠️
...gine/schemaregion/impl/SchemaRegionPBTreeImpl.java	0.00%	2 Missing ⚠️
...g/apache/iotdb/db/storageengine/StorageEngine.java	0.00%	2 Missing ⚠️
.../iotdb/db/storageengine/dataregion/DataRegion.java	66.66%	2 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18118      +/-   ##
============================================
- Coverage     41.84%   41.73%   -0.11%     
  Complexity      318      318              
============================================
  Files          5296     5301       +5     
  Lines        373593   373684      +91     
  Branches      48234    48234              
============================================
- Hits         156313   155960     -353     
- Misses       217280   217724     +444     

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[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
2.0% Duplication on New Code

See analysis details on SonarQube Cloud