[Fix][Connector-V2] Fix hive client thread unsafe

[corgy-w]

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Copilot]

Pull Request Overview

This pull request fixes a thread safety issue with the Hive client used by the Hive connector by refactoring resource management and removing the singleton pattern. The changes include:

• Replacing a singleton instance with a try-with-resources block in HiveTableUtils.java.
• Refactoring HiveMetaStoreProxy to implement Closeable and Serializable with explicit client initialization.
• Updating HiveSinkAggregatedCommitter to use the new HiveMetaStoreProxy instance and manage its lifecycle appropriately.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
seatunnel-connectors-v2/connector-hive/src/main/java/org/apache/seatunnel/connectors/seatunnel/hive/utils/HiveTableUtils.java	Refactored to use try-with-resources for HiveMetaStoreProxy, helping ensure proper resource cleanup.
seatunnel-connectors-v2/connector-hive/src/main/java/org/apache/seatunnel/connectors/seatunnel/hive/utils/HiveMetaStoreProxy.java	Removed singleton pattern, added explicit client initialization, and updated resource closing logic.
seatunnel-connectors-v2/connector-hive/src/main/java/org/apache/seatunnel/connectors/seatunnel/hive/commit/HiveSinkAggregatedCommitter.java	Integrated usage of the new HiveMetaStoreProxy instance and adjusted resource management.

Comments suppressed due to low confidence (1)

seatunnel-connectors-v2/connector-hive/src/main/java/org/apache/seatunnel/connectors/seatunnel/hive/utils/HiveMetaStoreProxy.java:183

• After closing hiveClient in the close() method, consider setting hiveClient to null to prevent accidental reuse of a closed client in subsequent calls.

if (Objects.nonNull(hiveClient)) { hiveClient.close(); }

[Hisoka-X]

Suggested change

	private HiveMetaStoreClient hiveClient;
	private transient HiveMetaStoreClient hiveClient;