feat: java example simplify

[Icemap]

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• v7.4 (TiDB 7.4 versions)
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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): develop: improve python mysqlclient sample code doc #14902

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
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[Icemap]

/cc @Oreoxmt @Mini256 @shizn @sykp241095

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[Icemap]

Related Code redirect to:

• https://github.com/tidb-samples/tidb-java-hibernate-quickstart
• https://github.com/tidb-samples/tidb-java-jdbc-quickstart
• https://github.com/tidb-samples/tidb-java-mybatis-quickstart
• https://github.com/tidb-samples/tidb-java-springboot-jpa-quickstart

[qiancai]

Removed the needs-cherry-pick-release-7.0 label because the v7.0 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v7.0 and will no longer receive new updates.

[Oreoxmt]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #14945.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #14946.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.2: #14947.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #14948.