[ISSUE #12773] Fix unfriendly message when adding duplicate permissions or roles.

[DirtyBit64]

What is the purpose of the change

Resolve the same issues in role management and permission management in the console : #12773.

Brief changelog

Modified com.alibaba.nacos.plugin.auth.impl.roles.NacosRoleServiceImpl.addXXX

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[github-actions]

Thanks for your this PR. 🙏
Please check again for your PR changes whether contains any usage/api/configuration change such as Add new API , Add new configuration, Change default value of configuration.
If so, please add or update documents(markdown type) in docs/next/ for repository nacos-group/nacos-group.github.io

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感谢您提交的PR。 🙏
请再次查看您的PR内容，确认是否包含任何使用方式/API/配置参数的变更，如：新增API、新增配置参数、修改默认配置等操作。
如果是，请确保在提交之前，在仓库nacos-group/nacos-group.github.io中的docs/next/目录下添加或更新文档（markdown格式）。

[DirtyBit64]

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