Improvemnet/dto merge

[leoafarias]

• Improved ShapeBorder and Decoration merge behavior.
• Removed ScalarAttribute not being used with this we could normalize the mergeable for Attribute and StyledAttribute.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (updating CI, tooling; no production code change)

Checklist before requesting a review

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• [] My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
mix-docs	⬜️ Ignored (Inspect)	Visit Preview		May 16, 2024 3:32pm

[github-actions]

DCM report

✅ no issues found!

Full report: https://github.com/conceptadev/mix/runs/25060686862