Add 3C3D IoTConsensusV2 integration tests

[Pengzna]

Add IT for IoTConsensusV2 on a 3 ConfigNode + 3 DataNode cluster.

Tests:

1. test3C3DWriteFlushAndQuery: Start 3C3D cluster, write data, flush, and verify data via query.
2. testReplicaConsistencyAfterLeaderStop: With replication factor 2, stop the leader DataNode and verify the former follower (new leader) serves the same data after failover.

Implementation details:

1. Config: IoTConsensusV2 batch/stream mode, DataReplicationFactor=2, SchemaReplicationFactor=3.
2. Uses getConnection(followerNode) to query the specific follower instead of a random available node.
3. Extends IoTDBRegionOperationReliabilityITFramework for getDataRegionMapWithLeader and cluster setup/teardown.
4. Uses getString() in verifyDataConsistency for IoTDB JDBC compatibility.

[Pengzna]

TODO: move @DailyIt to batch and stream files instead of base file