fix: Remove file type restrictions from FileInput in mixed-text-editor

[lefarcen]

Summary

Remove explicit accept prop and MIME type mapping from FileInput component in mixed-text-editor.

Changes:

• Removed getAcceptTypes function that mapped resourceTypes to MIME types
• Removed accept prop from FileInput, allowing all file types to be uploaded

Impact Areas

• Workflow Variables (File Upload)

Checklist

• I understand that this PR may be closed in case there was no previous discussion or issues.
• 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 ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/mashu/file-type

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