<feature>[zns]: add ZNS error code 10019

[ZStack-Robot]

Add error code ORG_ZSTACK_NETWORK_ZNS_10019 for the single-L3
restriction on ZNS-backed L2 networks.

Resolves: ZCF-2734

Change-Id: Id2f0042c36fb42f7ab3b4d69885fa0ec

sync from gitlab !9619

[coderabbitai]

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总体说明

在 CloudOperationsErrorCode 类中添加了新的公共常量 ORG_ZSTACK_NETWORK_ZNS_10019，用于表示特定的网络错误代码。

变更内容

内聚组 / 文件	变更摘要
错误代码常量 utils/src/main/java/org/zstack/utils/clouderrorcode/CloudOperationsErrorCode.java	添加新的公共静态最终字符串常量 ORG_ZSTACK_NETWORK_ZNS_10019，值为 "ORG_ZSTACK_NETWORK_ZNS_10019"。

代码审查工作量估计

🎯 1 (简单) | ⏱️ ~2 分钟

诗歌

🐰 新常数添一行，
错误代码云端翔，
网络通道更明畅，
代码库增色彩，
轻轻松松就完成！

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	PR标题遵循指定的格式 <type>[scope]: <description>，长度为40字符，符合72字符的限制，清晰地描述了主要变更。
Description check	✅ Passed	PR描述清晰地说明了添加的错误代码及其用途，与代码变更完全相关，提供了充分的上下文信息。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/shixin.ruan/shixin.ruan-zcf-2734@@2

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