[CI] Implement Testflight Workflow

[testableapple]

🔗 Issue Link

• https://stream-io.atlassian.net/browse/PBE-6273

🎯 Goal

Implement Testflight Workflow

☑️ Checklist

• [x] I have signed the Stream CLA (required)
• [ ] Changelog is updated with client-facing changes
• [ ] New code is covered by unit tests
• [ ] Affected documentation updated (docusaurus, tutorial, CMS (task created)

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamChatSwiftUI	7.99 MB	7.99 MB	0 KB	🟢

[github-actions[bot]]

Build for regression testing №65 has been uploaded to TestFlight 🎁

[github-actions[bot]]

Build for regression testing №66 has been uploaded to TestFlight 🎁