Disable multi-node REMOVE statements

[CRZbulabula]

Description

This PR restricts cluster-node removal statements to a single node ID in both SQL dialects.

• update the tree-model and table-model grammars so REMOVE DATANODE accepts exactly one DataNode ID
• construct a singleton DataNode ID list in both AST builders
• verify that tree-model and table-model parsers accept single-node REMOVE DATANODE / REMOVE CONFIGNODE statements and reject multiple node IDs
• remove the integration test for removing two DataNodes in one statement

Tests

• mvn -q test -pl iotdb-core/datanode -am -Dtest=RemoveNodeSingleNodeParseTest,RemoveNodeSingleNodeStatementTest -Dsurefire.failIfNoSpecifiedTests=false -DfailIfNoTests=false
• built and deployed a local pseudo-distributed 3 ConfigNode + 3 DataNode cluster from commit 63a44a745a
• verified all six nodes were Running with matching BuildInfo, with schema and data replication factors set to 2
• inserted and flushed tree-model sample data, then read the same three rows through DataNode RPC ports 6667, 6767, and 6867
• verified both tree-model and table-model parsers reject multi-node REMOVE DATANODE and REMOVE CONFIGNODE statements at the comma

[sonarqubecloud]

Quality Gate failed

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.41%. Comparing base (4861027) to head (63a44a7).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18360      +/-   ##
============================================
+ Coverage     43.14%   43.41%   +0.27%     
  Complexity      374      374              
============================================
  Files          5364     5366       +2     
  Lines        382623   382956     +333     
  Branches      49749    49809      +60     
============================================
+ Hits         165077   166259    +1182     
+ Misses       217546   216697     -849     

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