Fix a bug of ClientPool that rpc channel is not properly closed

[yhmo]

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[Copilot]

Pull request overview

This PR aims to fix resource-leak/cleanup behavior in the client pool so underlying RPC channels can be properly closed, and updates an example to reliably close pooled and non-pooled clients.

Changes:

• Make the ClientCache scheduler thread a daemon thread.
• On timer stop, return cached active/retired clients back to the underlying pool to enable proper destruction/closure.
• Update ConsistencyLevelExample to ensure MilvusClientV2Pool and the static MilvusClientV2 are closed.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
sdk-core/src/main/java/io/milvus/pool/ClientCache.java	Adjusts scheduler thread behavior and attempts to return cached clients to the pool during shutdown.
examples/src/main/java/io/milvus/v2/ConsistencyLevelExample.java	Ensures pool/client resources are closed via finally and at program end.

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