feat(data_export): register PolarDB For MySQL and OceanBase For Oracle as supported DB types

[LordofAvernus]

User description

Summary

• Register DBTypePolarDBForMySQL and DBTypeOceanBaseOracle as new DB type constants
• Add both types to ParseDBType function and supportedDataExportDBTypes map
• Enables data export support for PolarDB For MySQL and OceanBase For Oracle instances

Fixes https://github.com/actiontech/sqle-ee/issues/2815

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Description

• 添加对 "PolarDB For MySQL" 与 "OceanBase For Oracle" 的数据导出支持

• 修改 ParseDBType 函数，增加新类型判断分支

• 在 supportedDataExportDBTypes 中登记新 DB 类型

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Diagram Walkthrough

flowchart LR
  A["新增 DB 类型解析"]
  B["增加新常量定义"]
  C["更新支持的 DB 类型映射"]
  A -- "调用" --> B
  B -- "登记" --> C

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File Walkthrough

	Relevant files
Enhancement	const.go 更新解析函数和常量定义                                                                                            internal/dms/pkg/constant/const.go 在 ParseDBType 函数中加入 "PolarDB For MySQL" 与 "OceanBase For Oracle" case 分支 添加 DBTypePolarDBForMySQL 和 DBTypeOceanBaseOracle 常量定义 更新 supportedDataExportDBTypes 映射以支持新类型 +10/-2

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Persistent review updated to latest commit ca4678b

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