describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Refactor GitHub release notes creation to use printf for safer handling of special characters in automated deployments.
Main changes:

• Replaced heredoc-based release notes generation with printf command for better character escaping
• Simplified code by removing intermediate variables and using direct parameter substitution
• Added explanatory comment to clarify the purpose of the release notes formatting approach

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