Add duplicate button feature.

[ginkgoch]

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What is changed, added or deleted? (Required)

Add duplicate support for a changefeed.

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[gemini-code-assist]

Summary of Changes

Hello @ginkgoch, 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!

This pull request focuses on enhancing the user documentation for TiDB Cloud by introducing a guide for a new "duplicate changefeed" feature. The addition aims to provide clear instructions for users who wish to replicate existing changefeed configurations, streamlining their workflow and improving the overall usability of the platform.

Highlights

• Documentation Update: Added a new section to the changefeed-overview.md document, providing step-by-step instructions on how to duplicate an existing changefeed within TiDB Cloud.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new 'Duplicate a changefeed' feature. The changes are clear and follow the existing document structure. I've suggested a minor wording improvement to enhance clarity and conciseness, aligning with the repository's style guide.

[gemini-code-assist]

To improve clarity and conciseness, and to better align with the style guide's preference for addressing the user in the second person ("you"), I suggest a few wording improvements for these steps. This follows the principles of clarity (line 14), writing in the second person (line 22), and avoiding unnecessary words (line 24) from the repository style guide.

Suggested change

	3. TiDB Cloud auto-populates the new changefeed configuration using the original settings. Review and modify configurations as necessary for your new task.
	4. Once you have confirmed the configurations are correct, click **Submit** to create and start the new changefeed.
	3. TiDB Cloud automatically populates the new changefeed configuration with the original settings. You can review and modify the configuration as needed.
	4. After confirming the configuration, click **Submit** to create and start the new changefeed.

References

1. The documentation should be clear, simple, and readable. ^(link)
2. The documentation should address users in the second person ('you'). ^(link)
3. The documentation should avoid unnecessary words and repetition. ^(link)

[zoubingwu]

LGTM

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