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

• 注册PolarDB For MySQL常量

• 新增OceanBase For Oracle常量

• 更新ParseDBType函数新增分支条件

• 更新supportedDataExportDBTypes映射，支持新类型

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Diagram Walkthrough

flowchart LR
  A["更新ParseDBType函数"] -- "添加PolarDB For MySQL分支" --> B["返回DBTypePolarDBForMySQL"]
  A -- "添加OceanBase For Oracle分支" --> C["返回DBTypeOceanBaseOracle"]
  D["更新DB类型常量"] -- "新增OceanBase For Oracle常量" --> E["支持数据导出"]

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File Walkthrough

	Relevant files
Enhancement	const.go 修改函数和常量支持新数据库类型                                                                                    internal/dms/pkg/constant/const.go 修改ParseDBType函数，调整数据库类型判断逻辑 替换DBTypePolarDBMySQL为DBTypePolarDBForMySQL 新增对OceanBase For Oracle的支持分支 更新supportedDataExportDBTypes映射以包含新类型 +9/-5

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