chore: Add changelog for public field to PR template

[YounixM]

Add changelog for public field to PR template

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Note

Update PR template to capture user-facing change details.

• Adds a new 📝 Changelog section in .github/pull_request_template.md with fields: Deployment Type, Type, and Description
• Intended for documenting changes that affect users/APIs/UI; mark N/A for internal-only changes

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