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

• 新增 PolarDB For MySQL 注册逻辑

• 新增 OceanBase For Oracle 注册逻辑

• 更新常量定义和支持数据源映射

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Diagram Walkthrough

flowchart LR
  A["更新 ParseDBType 函数"] --> B["添加 PolarDB For MySQL 分支"]
  A --> C["添加 OceanBase For Oracle 分支"]
  D["更新常量定义"] --> E["新增 PolarDB For MySQL 常量"]
  D --> F["新增 OceanBase For Oracle 常量"]
  G["更新支持数据导出DB类型"] --> H["在映射中新增新类型"]

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File Walkthrough

	Relevant files
Enhancement	const.go 增加新数据库类型注册逻辑                                                                                          internal/dms/pkg/constant/const.go 在 ParseDBType 函数中增加新分支 在常量定义中添加新DB类型 在支持数据导出映射中更新新类型 +10/-2

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