feat: add copy and resend button for the question of chat

[hjlarry]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

currently, if we want the LLM give us another answer, we need to select all the text, copy, paste and send. This is not convience, especially when we need resend the images to LLM.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

local test in the debug pannel and front chat web page

• can copy text
• can resend text
• can resend text with multi images

[crazywoola]

Link #7661

[hjlarry]

Link #7661

this PR seems good, close now