Revert "为 TDengine 完善逻辑备份和恢复功能（基于 research/3.3.6-experimental 变基）"

[zyyang90]

Reverts #33395

[gemini-code-assist]

Summary of Changes

Hello @zyyang90, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在完全撤销 TDengine 中基于增量位图插件的逻辑备份和恢复功能的引入。通过此次回滚，所有相关的代码、文档、构建配置和测试基础设施都已从项目中移除，有效地将代码库恢复到该功能实现之前的状态。

Highlights

• 完整功能回滚: 此拉取请求完全回滚了为 TDengine 完善逻辑备份和恢复功能的增量位图插件，撤销了该功能的所有相关更改。
• 代码库清理: 所有与增量位图插件相关的源代码文件、头文件、CMake 构建配置以及 taosX 插件接口文件均已被移除，从而精简了代码库。
• 文档和测试基础设施移除: 该功能的所有文档（包括功能规范、测试规范和用户手册）以及 CI 工作流和各种测试脚本（单元测试、集成测试、端到端测试、性能测试、故障注入测试）均已删除。
• Gitignore 更新: 主 .gitignore 文件已更新，移除了与增量位图插件构建产物相关的条目，确保构建环境的整洁。

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Code Review

本次 PR 是一次回滚操作，旨在撤销之前合并的关于 “TDengine 逻辑备份和恢复功能” 的提交。变更内容主要是完整地删除了 plugins/incremental_bitmap 插件，包括其源代码、文档、测试及 CI 配置。同时，也相应地更新了根目录的 .gitignore 文件。经审查，本次回滚操作是彻底且正确的，未发现任何遗留问题。