build: add git-cliff for automated changelog and release notes

[DamianCzajkowski]

Summary

• Integrates git-cliff into the release workflow to auto-generate GitHub release notes during prepare_release.
• Adds a dedicated cliff.toml with conventional-commit grouping, stable-tag filtering, and release/changelog templates.
• Simplifies CHANGELOG.md to an unreleased template and shifts released-version history to GitHub Releases.
• Adds hatch shortcuts in pyproject.toml for local changelog/release-note generation:
  • changelog-preview
  • changelog-update
  • release-notes

Why

• Reduces manual release work and keeps release notes consistent.
• Makes changelog generation reproducible in CI and locally.
• Standardizes commit categorization and formatting for better readability.

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 50158875-8235-40b6-bc56-4d79e8bd7e53

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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 git-cliff

📝 Coding Plan

• Generate coding plan for human review comments

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