chore: remove unused link icon type

[GKTOKWR]

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Summary

fix #30396

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @GKTOKWR, 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 addresses a minor code cleanup by removing an unused 'link' icon type from the application's icon type validation logic. This change simplifies the codebase by ensuring that only currently supported icon types are recognized, improving maintainability and consistency within the application's data handling for icons.

Highlights

• Icon Type Validation: The 'link' icon type has been removed from the list of valid icon types during the creation or update of an application. Only 'emoji' and 'image' are now considered valid options.

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[gemini-code-assist]

Code Review

This pull request removes the unused 'link' icon type, which is a good cleanup. I've suggested a further improvement to use the IconType enum for validating icon types. This will make the code more maintainable and prevent the use of magic strings.

[crazywoola]

LGTM