[Swift6 migration] Added optional casting to some CoreData DTOs

[martinmitrevski]

🔗 Issue Links

Helps with https://stream-io.atlassian.net/browse/PBE-4993?atlOrigin=eyJpIjoiMDI5NDFhMTIxNDRiNDJlNDhkOTQxY2RkYWFjZDQ5NjgiLCJwIjoiaiJ9.

🎯 Goal

Fix errors in Swift 6 where explicit casting is needed for some CoreData DTOs.

📝 Summary

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🛠 Implementation

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🎨 Showcase

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🧪 Manual Testing Notes

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☑️ Contributor Checklist

• [ ] I have signed the Stream CLA (required)
• [ ] This change should be manually QAed
• [ ] Changelog is updated with client-facing changes
• [ ] Changelog is updated with new localization keys
• [ ] New code is covered by unit tests
• [ ] Comparison screenshots added for visual changes
• [ ] Affected documentation updated (docusaurus, tutorial, CMS)

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[github-actions[bot]]

	1 Message
:book:	Skipping Danger since the Pull Request is classed as Draft/Work In Progress

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[nuno-vieira]

CLosing this one for now.