Set daemon thread to fix jvm not exit

[shiyuhang0]

What problem does this PR solve?

Set thread to daemon so that the JVM can exit

[ti-chi-bot[bot]]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• xuanyu66
• zhangyangyu

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[shiyuhang0]

/run-all-tests

[shiyuhang0]

/merge

[ti-chi-bot[bot]]

@shiyuhang0: /merge in this pull request requires 2 approval(s).

In response to [this](https://github.com/pingcap/tispark/pull/2698#issuecomment-1537094752): >/merge Instructions for interacting with me using PR comments are available [here](https://prow.tidb.net/command-help). If you have questions or suggestions related to my behavior, please file an issue against the [ti-community-infra/tichi](https://github.com/ti-community-infra/tichi/issues/new?title=Prow%20issue:) repository.

[shiyuhang0]

/merge

[ti-chi-bot[bot]]

This pull request has been accepted and is ready to merge.

Commit hash: 25b88a1cdfa1c57c08712200eeb6168443972cad

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-3.1: #2699.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-3.2: #2700.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-3.0: #2701.